Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 20 of 20

Thread: Before I SLAM....

  1. Back To Top    #1

    Join Date
    Sep 2014
    Location
    Atoka, TN
    Posts
    15

    Before I SLAM....

    Opened it up last weekend with the newly installed SWG and am thinking at this point I need to SLAM. I've been unable to get FC going. At first, I added a jug of bleach to raise FC (according to pool math) to help the SWG out, then realized CYA was at 0. Over the last 4-5 days I've fixed that and here are my current readings:

    FC ~ 0
    pH = 7.2
    TA = 80-90
    CH = 160
    CYA = 65-70
    Salt = 3800-4000 (according to the cell.....aqua check test strips never made it above 1400 while I was adding salt according to charts. Luckily I checked the cell after 11 bags.....)

    Running the SWG and pump 24/7 after the last dose of stabalizer did get my FC up to .5 but no higher over a couple days. I disconnected the SWG today while I fully scrubbed and vacuumed the pool (finally warm enough to get in the water and it rained the last couple of days). Water appears crystal clear, but thinking I've got some lingering algae thats need killing. According to pool math, my pH is a little low too. Should I raise that or just move forward with the SLAM?

    Or, should I just add the 2.5 jugs of Clorox I have on hand tonight, wait a bit (how long should it take to get a reading after adding straight bleach?) and then check it again in the morning to see the drop? Thanks.
    19K gal 27' round AG; SwimPro by Hayward High Rate Sand filter, model SW256T; Hayward Power-Flo Pump, 2 HP, model EP1550LX; Circupool Si +30 SWG; K-2006 FAS-DPD test kit from Taylor

  2. Back To Top    #2

    TFP Guide

    Azgirl71's Avatar
    Join Date
    Apr 2015
    Location
    Sierra Vista, Az
    Posts
    2,586

    Re: Before I SLAM....

    What test kit are you using?
    Also what is your CC?
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

  3. Back To Top    #3
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    Location
    East Texas
    Posts
    9,004

    Re: Before I SLAM....

    I think you're on the edge of an algae bloom so get some FC in there now. Start the SLAM as is per the chlorine/cya chart in Pool School.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

  4. Back To Top    #4
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Before I SLAM....

    7.2 pH is excellent for a SLAM. Just do it. The faster you start, the quicker it will go.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  5. Back To Top    #5

    Join Date
    Jul 2014
    Location
    Hope Mills, NC
    Posts
    556

    Re: Before I SLAM....

    I just dont see anything in your test numbers or your description in your post that indicates a SLAM is needed. Water is clear and chemistry looks fine except for chlorine.

    Add the bleach required to get your chlorine level up or you will need to SLAM.

    But maybe Im missing something?
    16 x 32 17500 gallons
    Vinyl in-ground
    Hayward 250# Sand Filter
    1 HP Pump
    Hayward SWG

  6. Back To Top    #6

    Join Date
    Sep 2014
    Location
    Atoka, TN
    Posts
    15

    Re: Before I SLAM....

    Just tested and CC is 1.5.

    My test kit is the k-2006 from Taylor, FAS-DPD.

    Griswald: I was kind of thinking the same thing myself but am very new to this. Should I do anything tonight then? Maybe dump in required bleach and turn on SWG to see how it tests in the AM? Too late to make a Lowes clorox run.......Grizz game is on and I'm into some Ghost River golden......
    19K gal 27' round AG; SwimPro by Hayward High Rate Sand filter, model SW256T; Hayward Power-Flo Pump, 2 HP, model EP1550LX; Circupool Si +30 SWG; K-2006 FAS-DPD test kit from Taylor

  7. Back To Top    #7

    TFP Guide

    Azgirl71's Avatar
    Join Date
    Apr 2015
    Location
    Sierra Vista, Az
    Posts
    2,586

    Re: Before I SLAM....

    With the CC 1.5 there is something not right. Definitely calls for a SLAM
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

  8. Back To Top    #8
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,999

    Re: Before I SLAM....

    The fact that the chlorine is being consumed so quickly is indicative of something organic in the water. Probably early stage algae. Algae grows in the water for a while , then the sidewalls get slimy, then the water gets cloudy and then it turns green. Letting the chlorine level in your pool fall below the minimum level for your CYA will allow algae to start growing. Chlorine CYA Chart

    Definitely need to SLAM Your Pool
    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

  9. Back To Top    #9
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: Before I SLAM....

    Quote Originally Posted by Azgirl71 View Post
    With the CC 1.5 there is something not right. Definitely calls for a SLAM
    Yes, something is wrong with 1.5 CC.

    I would bring it to SLAM value, and see what happens with that, and your consumption rate.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  10. Back To Top    #10
    Defgufman's Avatar
    Join Date
    Mar 2015
    Location
    Savannah GA
    Posts
    577

    Re: Before I SLAM....

    Can't hurt to raise it to SLAM and test your over night loss. If you pass it and your cc drops you're probably safe.
    Inground 13,200 gal Vinyl, Pentair 3/4 hp pump, Pentair Sand Dollar filter, Polaris 280

    Pool School, Pool Math, CYA to FC ratio chart, Testing Kits

  11. Back To Top    #11

    Join Date
    Jul 2014
    Location
    Bastrop, Louisiana
    Posts
    199

    Re: Before I SLAM....

    If you hesitate on this, its going to get alot worse.
    Combined Chlorine is "used up" chlorine. Chlorine can only get "used up" in one way : organics. Unless you have alot of leaves / cut grass / etc.. in your pool or alot of bather waste, the only other highly logical organic would be algae.
    Start a SLAM now to take care of this before it gets too far gone.
    Randy H.

    Intex 18' X 48"
    G.A.M.E. Sandpro 75 Sand Filter (Single Speed 3/4 HP, 75 lbs sand, 2650 GPH, 7-way valve)

  12. Back To Top    #12

    Join Date
    Sep 2014
    Location
    Atoka, TN
    Posts
    15

    Re: Before I SLAM....

    Update:

    SLAM'd today at 11 AM with 6 jugs of 8.25%. Waited around an hour and measured FC at 24. A little low based on CYA of 65-70, maybe because I waited to measure it (doesn't the bleach need time to circulate anyways)? Now it's 4:30 PM and FC is back at zero, CC is at .5. Since I'm new to this, seems crazy adding bottles and bottles of bleach but that's my only option I assume? Again, water is crystal clear and no debris on the bottom, very small amount of floating pollen/grass.

    Should I be doing this at night maybe? Thanks everyone.
    19K gal 27' round AG; SwimPro by Hayward High Rate Sand filter, model SW256T; Hayward Power-Flo Pump, 2 HP, model EP1550LX; Circupool Si +30 SWG; K-2006 FAS-DPD test kit from Taylor

  13. Back To Top    #13
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Before I SLAM....

    Quote Originally Posted by CelticsFanForever View Post
    Update:

    SLAM'd today at 11 AM with 6 jugs of 8.25%. Waited around an hour and measured FC at 24. A little low based on CYA of 65-70, maybe because I waited to measure it (doesn't the bleach need time to circulate anyways)? Now it's 4:30 PM and FC is back at zero, CC is at .5. Since I'm new to this, seems crazy adding bottles and bottles of bleach but that's my only option I assume? Again, water is crystal clear and no debris on the bottom, very small amount of floating pollen/grass.

    Should I be doing this at night maybe? Thanks everyone.
    You should be checking the FC and adding more every hour or two, not just once a day. If you kill half the algae with the bleach and let FC sit at zero, it just starts growing again. You want to knock it down and kick it again and again, never letting it get back on its feet. Yes, it uses a LOT of bleach, but by letting it rebound, you actually end up using more over a longer period of time.

    The phrase SLAM means Shock Level And Maintain. Don't neglect the M.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  14. Back To Top    #14

    Join Date
    Sep 2014
    Location
    Atoka, TN
    Posts
    15

    Re: Before I SLAM....

    Thanks Richard.

    Noted. Between mothers day and our 10 month old, I picked a terrible day to start this. Going to try later in the week when I have the proper time to devote to it.
    19K gal 27' round AG; SwimPro by Hayward High Rate Sand filter, model SW256T; Hayward Power-Flo Pump, 2 HP, model EP1550LX; Circupool Si +30 SWG; K-2006 FAS-DPD test kit from Taylor

  15. Back To Top    #15
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,999

    Re: Before I SLAM....

    Definitely understand being busy! Keeping FC up as much as possible between now and then will help.
    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
    DaninFLA's Avatar
    Join Date
    Apr 2015
    Location
    Sarasota, FL
    Posts
    1,011

    Re: Before I SLAM....

    i had no problem doing my SLAM with only 3 measurements per day. I did it when I woke up, when I got home from work and again before bed. after the first day I got a feel for how many ppm the chlorine would drop during the day. mine was around 9ppm. so what I did is in the morning I added enough chlorine to make sure I was above the shock level the ENTIRE day. I believe my shock level was 20ppm, so I bumped my chlorine up to 29ppm in the morning. when I got home it would be right at 20. then I would just bump it to 25ppm and then check before I went to bed and did the same thing.

    its important for your FC to be at or above your shock level the entire time, that requires you to go a little bit over. the amount depends on when the next time you will be able to check is. if you are checking every 2 hours, then you can just go a couple ppm over. I didn't have that luxury.

    just don't go TOO high.

    I kept mine below the mustard algae level.
    Dan
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

  17. Back To Top    #17

    Join Date
    Apr 2015
    Location
    china grove,nc
    Posts
    71

    Re: Before I SLAM....

    Quote Originally Posted by CelticsFanForever View Post
    Update:

    SLAM'd today at 11 AM with 6 jugs of 8.25%. Waited around an hour and measured FC at 24. A little low based on CYA of 65-70, maybe because I waited to measure it (doesn't the bleach need time to circulate anyways)? Now it's 4:30 PM and FC is back at zero, CC is at .5. Since I'm new to this, seems crazy adding bottles and bottles of bleach but that's my only option I assume? Again, water is crystal clear and no debris on the bottom, very small amount of floating pollen/grass.

    Should I be doing this at night maybe? Thanks everyone.

    sounds like you are in the same boat I am in, its going to take some time and headache, it took me a week to relize what is going on as it didn't make sense and it finally clicked, these guys are the bomb and just listen to their advice

    my water was crystal clear and had no fc at all, and I ended up with over 80 gallons of various bleach before I finally could hold a fc for more then a few hours
    sj45 swg, tf-100 test kit, 16x32 ig 22,000 gal vinyl, Dolphin nautilus plus

  18. Back To Top    #18

    TFP Guide

    Kiss4aFrog's Avatar
    Join Date
    May 2013
    Location
    Hudson, WI
    Posts
    2,602

    Re: Before I SLAM....

    Except for CYA everything else can be tested in 20-30 minutes with the pump running and you should have an accurate reading.

    The only way to cut down on the amount of jugs would be to locate 12% bleach. It's a lot of bottles but it is the best way to do it and trust me, most of use have been there with cases and cases of bleach.
    Attached Images Attached Images
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

  19. Back To Top    #19

    Join Date
    Sep 2014
    Location
    Atoka, TN
    Posts
    15

    Re: Before I SLAM....

    Update: since Sunday night I decided to let the swg run on 100% to try and keep a little FC in the water until I could proper SLAM (vaca on thur-friday this week). I go out after work around 430 pm and here were my results:

    FC: 3
    pH: 7.4
    TA: 80-90
    CH: 160
    CC: 0
    CYA: 60
    Salt: 3900-4000 per the swg

    Needless to say, the neighbors got quite the happy dance show. Now I'm doing the OCLT test and just measured FC again at 4.5. Will see if it holds overnight. Going to get my CYA up to around 70 or so but otherwise it seems I'm in the clear. Thanks again everyone.
    19K gal 27' round AG; SwimPro by Hayward High Rate Sand filter, model SW256T; Hayward Power-Flo Pump, 2 HP, model EP1550LX; Circupool Si +30 SWG; K-2006 FAS-DPD test kit from Taylor

  20. Back To Top    #20

    TFP Guide

    Kiss4aFrog's Avatar
    Join Date
    May 2013
    Location
    Hudson, WI
    Posts
    2,602

    Re: Before I SLAM....

    Saving the world, one green pool at a time.
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

Posting Permissions

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