Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 13 of 13

Thread: Green Stains

  1. Back To Top    #1
    smc's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, Arizona
    Posts
    51

    Green Stains

    I'm back. Been a while.

    So I have the green problem again. Started in April (Arizona, about 80+ degrees in the pool). The pool chemical guy says it's not algae, but it has now spread. I can brush some off, but I fear there are stains now since it won't come off like it used to. I clean the filter, backwash, vacuum, and now testing religiously again. I have been disabled, so I haven't been able to brush every day or even swim. Every time I tell the service to tell the tech to SLAM/SHOCK the pool he leaves a note "Too much tree in pool, not algae."

    A few years ago, the original tech quit, the service didn't send another tech out for a few weeks, and the pool was a swamp. So cloudy green that you couldn't see the second step in the shallow end.

    If it's not algae what is it and how do I get rid of it?

    FC 6.5
    CC 0
    CH 1000
    TA 50
    CYA 100

    I know I forgot a couple, but ph was 7.5 and the other tests were ok from what I can remember. This was before draining to the skimmer level, vacuuming, and scrubbing again. Now filling and will repost levels and ugly pics if necessary. Of the pool, of course!
    26k gallon IG plaster/shotcrete
    Pentair 1 HP Hydropump
    C-9419 catridge filter
    Kreepy Krauly Cruiser

  2. Back To Top    #2
    smc's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, Arizona
    Posts
    51

    Re: Green Stains

    It's even growing on the new Kreepy Krauly!!!
    26k gallon IG plaster/shotcrete
    Pentair 1 HP Hydropump
    C-9419 catridge filter
    Kreepy Krauly Cruiser

  3. Back To Top    #3

    TFP Guide
    Mr Bruce's Avatar
    Join Date
    Mar 2014
    Location
    Greenville, SC
    Posts
    1,691

    Re: Green Stains

    The minimum FC for CYA of 100 is 7. I bet yours is higher. Have you done the diluted CYA test?
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

  4. Back To Top    #4

    TFP Guide

    Catanzaro's Avatar
    Join Date
    Jul 2014
    Location
    Howell, New Jersey
    Posts
    1,320

    Re: Green Stains

    The pool chemical guy says it's not algae
    Take some water out of the pool and place in a clear clean glass. What does the water look like? Water in a clean glass will not look as green when a pool has algae. Unless you have metal stains in the pool, it is probably algae, but hard to tell. Where are the stains and what do they look like? What size are the stains and are they scattered all over the pool? And what does "too much tree in the pool" mean?

    Please take some pictures of the stains (as close as possible) and pictures of the pool water, etc. Let's try to get this figured out. Maybe take a step back and try to remember last time the water was crystal clear and how the problem surfaced over time.
    14,700 gallons IG Pool Vinyl Liner - Octal Circulation System
    Hayward Pro-Series 350 LB. Sand Filter Model # S270T - 2" Plumping
    Frog Mineralizer System (EMPTY) - Hayward Super Pump 2 HP Model # k48m2n111
    Pool Company tests water (NO LONGER) TF-100 TEST KIT
    Date of Build is 11-2013

  5. Back To Top    #5
    smc's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, Arizona
    Posts
    51

    Re: Green Stains

    Clear water. "Too much tree" means the tree matter in the pool...I think. I'll see if I can get better pics - the ones I took earlier really don't show anything but what looks like green water.

    It started with half the wall in the deep end. When the temperature heats up, algae blooms, right? Now the whole wall is covered (since I was "down") and there are new patches even in the bottom of the shallow end. The only metal in the pool/system is the ring around the light.
    26k gallon IG plaster/shotcrete
    Pentair 1 HP Hydropump
    C-9419 catridge filter
    Kreepy Krauly Cruiser

  6. Back To Top    #6

    TFP Guide


    Join Date
    Feb 2015
    Location
    Chandler AZ
    Posts
    709

    Re: Green Stains

    In Tucson, it's probably not metal stains - unless the OP is on a well or the pool has been treated with stuff containing metals.

    With the CYA reported as 100, it could be much higher. The recommendation to due a diluted test for CYA is a good one.

    With the reported CH of 1000, you are approaching the upper limit of being able to keep your CSI in line with the recommendation here on TFP. And if you haven't been actively keeping your pH down, you are very susceptible to scaling. That possible scaling along with the green you are seeing could lead to "staining" - the green could get trapped in the scaling and be nearly impossible to just brush off.

    You could try putting about 2 gallons of pool water in a white plastic 5 gallon bucket. If it has a greenish tint, add about one cup of bleach and stir it around for a few minutes. If the water clears up (some debris, dead algae on bottom), it's most probably algae.

    Given the high CH (1000) and a CYA of 100+, you are probably in for a drain/refill or an RO treatment in the near future.

    - - - Updated - - -

    Tree matter is organics and will use chlorine up. With the high CYA and not enough chlorine, algae will grow.
    Gene
    ​12,300 gal IG play pool - Pebbletec - built 10/1999 || Hayward S360SX 36" sand filter || Hayward Ecostar SP3400 VSP || A&A In-Floor cleaning system || Quik Water Leveler || Quik Dek-clor (limited use)
    TF-100 testkit / Speedstir - A good test kit is not an expense, it's an investment

  7. Back To Top    #7
    smc's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, Arizona
    Posts
    51

    Re: Green Stains

    Looks better since I cleaned it, but...





    26k gallon IG plaster/shotcrete
    Pentair 1 HP Hydropump
    C-9419 catridge filter
    Kreepy Krauly Cruiser

  8. Back To Top    #8
    smc's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, Arizona
    Posts
    51

    Re: Green Stains

    Quote Originally Posted by proavia View Post
    In Tucson, it's probably not metal stains - unless the OP is on a well or the pool has been treated with stuff containing metals.

    With the CYA reported as 100, it could be much higher. The recommendation to due a diluted test for CYA is a good one.

    With the reported CH of 1000, you are approaching the upper limit of being able to keep your CSI in line with the recommendation here on TFP. And if you haven't been actively keeping your pH down, you are very susceptible to scaling. That possible scaling along with the green you are seeing could lead to "staining" - the green could get trapped in the scaling and be nearly impossible to just brush off.

    You could try putting about 2 gallons of pool water in a white plastic 5 gallon bucket. If it has a greenish tint, add about one cup of bleach and stir it around for a few minutes. If the water clears up (some debris, dead algae on bottom), it's most probably algae.

    Given the high CH (1000) and a CYA of 100+, you are probably in for a drain/refill or an RO treatment in the near future.

    - - - Updated - - -

    Tree matter is organics and will use chlorine up. With the high CYA and not enough chlorine, algae will grow.
    I was doing a partial drain to the skimmer every time I vacuumed. I rigged up a hose to a single output jet on one setting of the jandy valve, since the drain was disabled a couple owners ago. This was keeping everything in check, because I didn't want a repeat of the green swamp. I noticed some green in April that I have been able to scrub off, and the past month I have been trying to get the chemical company to do their part because it won't come off anymore. I was able to get the CH down around June and July, but either the plaster is degrading faster or the tap water is getting harder.

    Who does RO and how much do they charge?

    I'm off to buy more bleach...

    EDIT:

    PH has been around 7.2-7.5. The tech comes every Friday, but I always forget to test after he visits. And there hasn't been much wind or debris blowing in the pool, even with the hurricane storm we had. The Monsoon was a bit light this year, at least on this side of town.
    26k gallon IG plaster/shotcrete
    Pentair 1 HP Hydropump
    C-9419 catridge filter
    Kreepy Krauly Cruiser

  9. Back To Top    #9

    TFP Guide


    Join Date
    Feb 2015
    Location
    Chandler AZ
    Posts
    709

    Re: Green Stains

    You may want to do an OCLT. Pool School - Perform the Overnight FC Loss Test (OCLT)
    But you may want to get a handle on the CYA first - at least do the dilution test to see if and how much over 100 it may be.


    Here's the Chlorine/CYA Chart for reference
    Pool School - Chlorine / CYA Chart
    Gene
    ​12,300 gal IG play pool - Pebbletec - built 10/1999 || Hayward S360SX 36" sand filter || Hayward Ecostar SP3400 VSP || A&A In-Floor cleaning system || Quik Water Leveler || Quik Dek-clor (limited use)
    TF-100 testkit / Speedstir - A good test kit is not an expense, it's an investment

  10. Back To Top    #10

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    29,872

    Re: Green Stains

    If it's green and it's growing it is algae.

    Your CH is quite a bit too high and your CYA is too high.

    Step 1 is to drain the pool by about 50% to get the CYA and CH to a manageable level.

    Step 2 is to SLAM the pool. That's not just adding chlorine to you pool. It involves brushing, vacuuming, cleaning and high chlorine levels all working in concert to clear your pool.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  11. Back To Top    #11
    smc's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, Arizona
    Posts
    51

    Re: Green Stains

    Right. Drain to skimmer again. Brush. Vacuum. Repeat. Add chlorine when CYA and CH are lowered. Ask why the pool tech isn't giving the problem more attention.
    26k gallon IG plaster/shotcrete
    Pentair 1 HP Hydropump
    C-9419 catridge filter
    Kreepy Krauly Cruiser

  12. Back To Top    #12

    TFP Guide


    Join Date
    Feb 2015
    Location
    Chandler AZ
    Posts
    709

    Re: Green Stains

    Any chance you can pump out lower than the bottom of skimmer all at once? This would waste a lot less water than a 6" drain and refill a bunch of times. I think it may be best to do the diluted test for CYA and see what that number is. Then you can plug those numbers into Pool Math to see how much you need to drain. If you're unable to drain lower than your skimmer with your present set up, ask the pool tech if he will lend you a sump pump to drain the water down.

    Also, test your fill water CH. You want to lower your pool CH also as it's quite high. Plug those numbers into Pool Math to get an estimate of what your CH will be if you drain xx% of water.
    Gene
    ​12,300 gal IG play pool - Pebbletec - built 10/1999 || Hayward S360SX 36" sand filter || Hayward Ecostar SP3400 VSP || A&A In-Floor cleaning system || Quik Water Leveler || Quik Dek-clor (limited use)
    TF-100 testkit / Speedstir - A good test kit is not an expense, it's an investment

  13. Back To Top    #13
    smc's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, Arizona
    Posts
    51

    Re: Green Stains

    This morning after draining to the skimmer, vacuuming, and brushing:

    FC 4.5
    CC 0
    CH 1125
    TA 60
    CYA 80

    PH 7.8

    I cannot drain lower than the skimmer.

    Added 2 gallons bleach FC is 15 now. Already looks a little better...or maybe it's because the sun in hitting it.
    26k gallon IG plaster/shotcrete
    Pentair 1 HP Hydropump
    C-9419 catridge filter
    Kreepy Krauly Cruiser

Posting Permissions

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