Become a TFP Supporter Pool Math Forum Rules Pool School
Page 1 of 2 12 LastLast
Results 1 to 20 of 28

Thread: Green Water after Chlorine Addition

  1. Back To Top    #1

    Join Date
    Apr 2014
    Location
    Mobile, Alabama
    Posts
    75

    Green Water after Chlorine Addition

    So I'm pretty sure I know what's happening. I did the ascorbic acid treatment in my pool about a month ago because my steps were yellowed. I followed all the steps, except the part where I add sequestrant. After I started adding chlorine, the water turned a pale green. I assumed it was causing the metal in the water to precipitate out after mixing with the chlorine. On 2-15-16, I bought $50 worth of sequestrant and the green cleared up. Last week, I started checking my levels in advance of prepping the pool for open toward the end of next month. My initial readings were:

    FC 0
    CC 0
    pH 7.3
    TA 40
    CYA 0

    I have since added about 6 lbs. of CYA to bring that level up, about 8 lbs. of baking soda so that my TA is around 65-70 right now, and about 2.5 gallons of chlorine spread out over the week. This morning, I noticed the deep end is greenish. After getting home from work, the pool is now pale green again. I assume I can dump more money into sequestrant, but what would happen if I did nothing? Wouldn't the stairs just yellow again? The pool looked great last season except for the yellow stairs. If I'm gonna have to spend an extra $100 or so a month on sequestrant, I'd rather just have yellow stairs. On that topic, do those CuLator packets really work?

    Kevin T
    16' x 32' Vinyl Liner Grecian Pool. 20,000 Gallons. Sta-Rite SuperMax 1HP Pump (PHK2RA6E-102L). W. Cooper Ranger Series 25" Sand Filter. Dolphin Nautilus Plus.

  2. Back To Top    #2
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,942

    Re: Green Water after Chlorine Addition

    Since you are no stranger to metals in the water, I agree and suspect that not only did the chlorine make the metal precipitate, but may also cause the stairs to change color just like last season. But before going to much further, I would simply to let the chemical levels adjust from what you've recently added. Let the CYA show a good reading in a few days and re-check all the levels one more time so you know for sure where you stand chemically. The fact that your water had 0 FC and 0 CYA can make for some whacky conditions, so that's why I would recommend ensuring you can balance the pool the TFP way first (hold FC levels as well each day), then if needed later, consider your sequestrant options.

    I have no personal experience with the CuLator packets, but I'm sure someone else will chime in.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  3. Back To Top    #3

    Join Date
    Apr 2014
    Location
    Mobile, Alabama
    Posts
    75

    Re: Green Water after Chlorine Addition

    For reference, I just did a FAS/DPD test. The result was:

    FC 4
    CC 2

    Kevin T
    16' x 32' Vinyl Liner Grecian Pool. 20,000 Gallons. Sta-Rite SuperMax 1HP Pump (PHK2RA6E-102L). W. Cooper Ranger Series 25" Sand Filter. Dolphin Nautilus Plus.

  4. Back To Top    #4
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,942

    Re: Green Water after Chlorine Addition

    Yes then, before adding any sequestrant, I would continue to balance. The high CC is indicative of the transition process happening in your water and you may very-well need to SLAM. Don't add any more stabilizer just in case so that if you do have to SLAM you can maintain a lower FC shock level. At this point, I would adjust pH to 7.2-7.4 (pre-SLAM) and consider performing an OCLT. I'm fairly confident the OLCT will confirm you need to SLAM, but it would be good to know for sure. You'll want that water algae-free before trying to do any further water management. Best to confirm which type of "green" you are fighting.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  5. Back To Top    #5

    Join Date
    Apr 2014
    Location
    Mobile, Alabama
    Posts
    75

    Re: Green Water after Chlorine Addition

    Added 2.5 gallons of 10.5% last night around 6:30 p.m. and tested the water about 7:20 p.m. Readings were:

    FC 14.5
    CC 1.5

    I did the OCLT test, but I must've not waited long enough last night because this morning around 6:30 a.m. my readings were:

    FC 17
    CC .5

    I went ahead and tested everything else. Currently:

    pH 7.9-8.0
    TA 90
    CYA 45-50

    I've been battling pH since last season. I keep bubbles in my pump basket lid so obviously there is an air leak somewhere that I have yet to find. I checked everything I could think of so I'll probably have to call a repair company to finally get the air leak solved/fixed. Here's a shot of my pool this morning with the sun behind me at 9:45 a.m. Needs a little Nautilus-ing. There's no visible algae anywhere that I can see in the pool. That's why I think the chlorine is causing the metal to precipitate out.

    Kevin T
    Attached Images Attached Images
    16' x 32' Vinyl Liner Grecian Pool. 20,000 Gallons. Sta-Rite SuperMax 1HP Pump (PHK2RA6E-102L). W. Cooper Ranger Series 25" Sand Filter. Dolphin Nautilus Plus.

  6. Back To Top    #6
    smforte's Avatar
    Join Date
    Sep 2013
    Location
    Montgomery,Al
    Posts
    668

    Re: Green Water after Chlorine Addition

    Hey Kevin...we have the same pool! And the same metals problem. Yours looks like algae. After the AA treatment you may have waited too long to get the FC up. After the AA treatment it's a bugger to get the FC back up. As far as your PH reading it will be unreliable with a FC higher than 10.

    I have found because of metals I have to keep my ph lower around 7.2 with lower FC. Any higher and the metals come back. I just try to keep my levels where I never need to slam. After my first AA I also missed the part about adding seqestrants and battled it all summer. Before I open in a couple of weeks gotta do it all over again. It sure is hard to beat!
    Montgomery, AL
    27000 16 x 36 IG, Vinyl, Grecian, Hayward Sand filter, 1 HP Pentair whisperflo motor, Aqua Genie filter not by choice, no extra jets, Dolphin s300i robotic cleaner,Taylor K 2006 test kit, speed-stir which I couldn't live without!

  7. Back To Top    #7
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: Green Water after Chlorine Addition

    Good advice smforte!

    If the water is green and cloudy then it is algae. If it is green and clear then it is metal.

    More on metals and PH here, Pool School - Metals in the Water and Metal Stains
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

  8. Back To Top    #8
    smforte's Avatar
    Join Date
    Sep 2013
    Location
    Montgomery,Al
    Posts
    668

    Re: Green Water after Chlorine Addition

    Quote Originally Posted by pooldv View Post
    Good advice smforte!

    If the water is green and cloudy then it is algae. If it is green and clear then it is metal.

    More on metals and PH here, Pool School - Metals in the Water and Metal Stains
    Yea! Thanks pooldv. Finally starting to learn enough to contribute!
    Montgomery, AL
    27000 16 x 36 IG, Vinyl, Grecian, Hayward Sand filter, 1 HP Pentair whisperflo motor, Aqua Genie filter not by choice, no extra jets, Dolphin s300i robotic cleaner,Taylor K 2006 test kit, speed-stir which I couldn't live without!

  9. Back To Top    #9

    Join Date
    Apr 2014
    Location
    Mobile, Alabama
    Posts
    75

    Re: Green Water after Chlorine Addition

    The water is green and clear at this point so I assume it's the metal. It was slight green yesterday morning and noticeably green yesterday evening. I've never known algae to take over that fast, especially since my water temp is 60-62 F. Plus, there are no blooms in the corners of my pool where I see algae usually begin. Trying to decide how much effort I want to put into fighting yellow steps at this point. May try to the sequestrant / CuLator route if I decide to do battle. Otherwise, I may just throw in the towel for this season and try again next year. I still have a couple pounds of ascorbic acid in my pantry.

    Kevin T
    16' x 32' Vinyl Liner Grecian Pool. 20,000 Gallons. Sta-Rite SuperMax 1HP Pump (PHK2RA6E-102L). W. Cooper Ranger Series 25" Sand Filter. Dolphin Nautilus Plus.

  10. Back To Top    #10

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,078

    Re: Green Water after Chlorine Addition

    First, forget the culator. It removes metals but the capacity isn't adequate. To buy enough to get rid of the metals, the cost goes way, way up.

    So, iron is in your water and WILL STAY IN YOUR WATER FOREVER either 1) in solution or 2) precipitated out onto your walls.

    You can get rid of it by changing your water source. (Refill with iron free water, using replacement water from a water softener, R/O)

    Otherwise you can just live with it by spending some money on sequestrant and carefully monitoring all your parameters.

    All hard choices but an iron-laden pool is a real pain.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  11. Back To Top    #11

    Join Date
    Apr 2014
    Location
    Mobile, Alabama
    Posts
    75

    Re: Green Water after Chlorine Addition

    So the iron won't just rebind to the steps and skimmer assembly? That's where all the yellow was before.

    Kevin T
    16' x 32' Vinyl Liner Grecian Pool. 20,000 Gallons. Sta-Rite SuperMax 1HP Pump (PHK2RA6E-102L). W. Cooper Ranger Series 25" Sand Filter. Dolphin Nautilus Plus.

  12. Back To Top    #12
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,942

    Re: Green Water after Chlorine Addition

    Kevin, the steps may discolor again like last year, but the amount and exact location of staining could change depending on the chemistry at the time. As you already know, managing a pool with metals is a bit of a challenge. But before you try this season, you must make sure your water is algae-free. Your past set of results in post #5 indicate you are not quite there yet. I would highly encourage you to continue with the SLAM until you pass all 3 SLAM criteria, then you can look at sequestrant additives. If you add sequestrant too soon and find your pool still has algae, you'll end-up increasing FC again and defeating the purposes of the sequestrant. And don't forget .... your pH will be high because of the high FC, so don't bother testing pH until the SLAM is done. Save your reagents.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  13. Back To Top    #13

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,078

    Re: Green Water after Chlorine Addition

    It will precipitate back out onto the steps and skimmer if you fail to keep sequestrant in the pool (it "wears out").

    The iron is in your pool either as a solid (on your steps) or in solution controlled by sequestrant and pH. Hard choices.

    EDIT: I just saw Texas Splash's post.....he is absolutely correct. Make sure your algae is gone and you have all your parameters in good order. After you have accomplished that (and it may take a while), only then should you address you staining.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  14. Back To Top    #14

    Join Date
    Apr 2014
    Location
    Mobile, Alabama
    Posts
    75

    Re: Green Water after Chlorine Addition

    Would this be a good sequestrant to use?

    VINYL LINER BLUE STUFF - Stain and Scale Control - 32 oz - #JMBLUEVINYL032 - Stuff for the Pool - Our Stuff - Product Catalog - Jack's Magic Products, Inc.

    I still have to solve my pH rise problem so I'm probably gonna be fighting this for a while.

    My current numbers are:

    FC 10.5
    CC 2.5
    pH 7.7 -7.8
    TA 80
    CYA 50

    I guess I'll focus on the SLAM and shift my focus the metals after that. That seems to be the gist I'm getting from this thread.

    Kevin T
    16' x 32' Vinyl Liner Grecian Pool. 20,000 Gallons. Sta-Rite SuperMax 1HP Pump (PHK2RA6E-102L). W. Cooper Ranger Series 25" Sand Filter. Dolphin Nautilus Plus.

  15. Back To Top    #15
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: Green Water after Chlorine Addition

    Getting your TA down to 60 or so will probably help reduce PH rise. Here is how, Pool School - Lower Total Alkalinity

    There are Jack's Magic recommendations in the Pool School article I linked above.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

  16. Back To Top    #16

    Join Date
    Apr 2014
    Location
    Mobile, Alabama
    Posts
    75

    Re: Green Water after Chlorine Addition

    At this point, I'm attempting to SLAM so messing with TA isn't on the horizon until I'm done with that. I just don't know where to turn to next once I'm done SLAM-ing. TA? Metals? My wife thinks we should just drain and refill, but I'm not so sure.

    Kevin T
    16' x 32' Vinyl Liner Grecian Pool. 20,000 Gallons. Sta-Rite SuperMax 1HP Pump (PHK2RA6E-102L). W. Cooper Ranger Series 25" Sand Filter. Dolphin Nautilus Plus.

  17. Back To Top    #17

    Join Date
    Aug 2014
    Location
    Northern IL
    Posts
    4,615

    Re: Green Water after Chlorine Addition

    Does your fill water have metals?

  18. Back To Top    #18
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,942

    Re: Green Water after Chlorine Addition

    Kevin, based on your water bill, you could probably estimate how much it would cost to drain your 20K pool versus several gallons of bleach. But also important is the stability of your ground. Many pools have lifted or encountered structural issues when drained, so be sure to keep that in mind when you discuss. The SLAM will of course clear the algae, but any metal will remain unless you have a metal-free source to refill. If you chose to keep the water, I would simply continue with the SLAM then adjust the other levels afterwards. They will be fine until then.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  19. Back To Top    #19

    Join Date
    Apr 2014
    Location
    Mobile, Alabama
    Posts
    75

    Re: Green Water after Chlorine Addition

    Not certain what's in my fill water. It's not well water. I'm on city water. I have a septic system so water should be cheaper, ie no sewage fee. Just looking at my pool, it appears that the stairs are starting to yellow again. The wife suggest I just throw "something" else into the pool for the metal (iron?) to bind to. Pretty sure it's not that easy. Maybe I can find a ton of blonde wigs for the iron to leach onto. Guess this just may be a battle for another time as I still have to find where my suction side air leak is and get that repaired. Both return jets constantly blow bubbles into the pool which I assume is what's causing my pH to continue to rise via aeration.

    Kevin T
    16' x 32' Vinyl Liner Grecian Pool. 20,000 Gallons. Sta-Rite SuperMax 1HP Pump (PHK2RA6E-102L). W. Cooper Ranger Series 25" Sand Filter. Dolphin Nautilus Plus.

  20. Back To Top    #20
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,942

    Re: Green Water after Chlorine Addition

    After you finish and pass the SLAM, I would go back and re-read the link pooldv provided in post #7 about metals in the water. Once the algae is confirmed to be eliminated, you can control the side effects of metals in the water. Yes, that may require a sequesrant for the metals to "bind to" as your wife noted, but the water chemistry must be correct first.

    If you have any doubt about your fill water (source), take a sample to the pool store and see what they say about metals - if there are any. If they say none, then perhaps it's from something else added to the water in the past. Some pool store products can do that. Post back when you pass the 3 SLAM criteria and we'll do what we can to help you further.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •