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Thread: Pre-SLAM help!

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    Pre-SLAM help!

    I have a 20X40 (36,000 gallon) green pool! I attached a picture. We have had the pool for 5 years and I have never had any issues getting the water balanced. I am so frustrated with this green algae. It is July and we still can't swim!!! I had the water tested and confirmed that there is no iron, copper or manganese; just good old green algae. The sweet people at the pool store sold me some powder shock and algacide which I added on Sunday and nothing really happened. This is after trying to just shock ( powder) and clear it on my own for several weeks with no sign of improvement. I have officially learned my pool store lesson.....

    The water has actually cleared some it is just still green ( fairly clear but not colorless). I ordered my FAS-DPD test kit and it came in the mail yesterday. I have bought the bleach and I plan to start tomorrow; I am off work so will have the time to test and adjust as needed. My CYA is between 60-80. Last night after the sun went down I went out and tested the water; 12ppm FC and 0.25CC. The FC is still high from shocking on Sunday; I presume. I turned off the chlorinator ( SWG). I got up early this morning ( before the sun was shining) and tested the water again ; it was the same 12ppmFC and 0.25CC. So technically I already pass the OCT , right? I was expecting the FC to go down since there is clearly still algae in the water. I have no idea how high the chlorine level was before I added the shock on Sunday so I don't know how far it had to drift down to get to 12ppm. I am just looking for some answers before I jack the chlorine level up tomorrow. I am afraid I will raise it to 31ppm and it will not drop....

    What am I missing here guys? I am DETERMINED to get this thing clear and swimable as soon as possible.
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    Mod Squad YippeeSkippy's Avatar
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    Re: Pre-SLAM help!

    Are you running your filter 24/7? What kind of filter do you have, and does it need cleaning? Have you been brushing daily?
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
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    Re: Pre-SLAM help!

    Hit me now... but is there another store around to test for metals? It seems odd to have that much green color yet I can still make out piles of debris in the deep end?? And no overnight chlorine loss seems puzzling.

    Since you are so close to 10 ppm FC, I would let it drift down and run a full battery of tests especially ph and CH. Get all those test results so the experts can help forge a path for you.

    Sorry you are having issues, frustrating to say the least. But congrats on the test kit.
    16' x 32' (21100 gal), vinyl, 1.5 hp Hayward SuperPump,
    Tagelus TA60/60D Sand Filter, Raypak 399K Digital Heater, TF-100

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    Re: Pre-SLAM help!

    I have sand filter, running 24/7. I have been backwashing and rinsing but I have not been brushing daily. Today, I am going to vacuum it really well ( now that I can actually see the bottom) and I will give it a good brushing. Should I wait a few more days to see what happens before I slam it?

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    Re: Pre-SLAM help!

    Ok, let's get your pool clear.

    Pre-SLAM...

    Vacuum and brush that junk off the bottom. vacuum and brush it again when it settles back to the pool floor. Pay attention to your psi gauge....backwash when it goes up 25%

    That's not white foam around the edges, is it?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Pre-SLAM help!

    Pool Tool....I am still a little suspicious of metals myself. I don't have well water though and have no idea where the metal would come from. There is only one store within 30 minutes of my house. Can I buy a kit to test for metals myself? Should I let it drift all the way down to ~4ppm before testing again?

    - - - Updated - - -

    Duraleigh....no white foam

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    Re: Pre-SLAM help!

    Once FC is below 10 you can retest. I think there may some metal tests available at big box stores (Lowes, HD) but I have never looked for or tried them.
    16' x 32' (21100 gal), vinyl, 1.5 hp Hayward SuperPump,
    Tagelus TA60/60D Sand Filter, Raypak 399K Digital Heater, TF-100

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    Re: Pre-SLAM help!

    I do not eliminate metals either but that junk on the bottom is surely not metals (iron) so you can start there. Secondly, the SLAM will probably determine if there is any iron in that pool and may just precipitate it out.

    The Taylor K-1766 is a good test for iron if you want it. You do not need to lower FC to use it.

    I would still SLAM the pool wholeheartedly and see what results.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Pre-SLAM help!

    Thanks guys! My current plan is to get the pool clear of debris and brush really really well tonight when I get home from work. Gonna get up in the morning and head to Leslie's to get the water tested; just to definitively rule out metals and get an second read on all of my levels. Given there is no iron, I am going to calculate my SLAM level and get started. I will update and probably have lots more questions.....

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    Re: Pre-SLAM help!

    Great plan, though very little is ever definitive from the pool store

    Don't forget to lower ph to 7.2 prior to SLAMming and follow the process to the T as it will save you a lot of time and aggravation.
    16' x 32' (21100 gal), vinyl, 1.5 hp Hayward SuperPump,
    Tagelus TA60/60D Sand Filter, Raypak 399K Digital Heater, TF-100

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    Re: Pre-SLAM help!

    Thanks Pool Tool! What is the best thing to use to lower the pH. Right now pH is 7.4. Looking at Pool Math I see it references Borax, muriatic acid and soda ash. Is one better than the other?
    20 X 40 in-ground, vinyl liner, 36K gallons, SWG, sand filter.

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    Pool Tool's Avatar
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    Re: Pre-SLAM help!

    I use MA. Some people prefer to work with the others since the liquid can splash and the odor can be strong. You can try the different option on "effects of adding chemicals" on Poolmath to see what else each chemical adds. For me, I like the liquid - it is cheap and stores well.
    16' x 32' (21100 gal), vinyl, 1.5 hp Hayward SuperPump,
    Tagelus TA60/60D Sand Filter, Raypak 399K Digital Heater, TF-100

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    Mod Squad YippeeSkippy's Avatar
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    Re: Pre-SLAM help!

    Allyb-You need to recognize that the Pool Math app will suggest the right chemicals for your desired goals. Borax and soda ash do NOT lower pH but rather raise it. You need Muriatic Acid (MA) to lower pH.
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain

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    Re: Pre-SLAM help!

    Thanks for clarifying how to use poolmath. I do see now that it has both types of chemicals listed for pH up and pH down. Makes sense borax and soda ash are basic and would up the pH. I have some MA on hand that I use to clean my salt cell so that should work fine. Thanks again!

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    Re: Pre-SLAM help!

    I do not see where you have a test kit. If so, you simply cannot SLAM.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    poolnoob.ca's Avatar
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    Re: Pre-SLAM help!

    Dave, In 2nd paragraph of first post says got fas-dpd in the mail
    32,000L Fibreglass Leisure Pools IG 12.5'x23'x5' Pump: AstralPools BX1 1.0HP
    Filter: AstralPools ZX-310 SWCG: AstralPools VX7T
    Heater: Hayward H250FDN Test Kit: TF-100

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    Re: Pre-SLAM help!

    Deep end; it is more clear around the edges...greener as you get toward center
    brown steps





    Okay.....this is what I have done and the results I have so far...

    1. Double chekded with Leslie's that water contained no iron ,copper, or manganese. I know they may not be accurate but I have no other way of testing for metals. No metals found. Confirmed CYA at 70 and pH at 7.6


    2. Inital testing wiht FAS-DPD; FC 7ppm, CC=.25ppm. Used phenol red drop test to confirm pH at 7.6. Added 96oz of dry acid to target pH of 7.2. Waited an hour and retested- pH was 7.2.

    3. Caculated my Shock level for SWG to be 28ppm, based on CYA of 70. I caluclated using Pool Math that I needed 1,119oz of 8.25% bleach (121 oz). At 2 pm I added 9.5 bottles of the bleach. Readings have been as follows:

    3pm- FC=48pmm ( overshot the amount of maybe not yet mixed well?)- CC=0.5ppm
    5:30pm- FC-40ppm, CC=0.5ppm
    8pm: FC=31, CC=.5ppm
    9:30am- FC=30, CC=0.5ppm
    2:30pm- FC=27ppm, CC=.25ppm

    I am not losing chlorine as fast as I thought I would. I have attached some pictures of what the pool looks like now. My steps now have a nice brown color to them leading me to believe that this might be a metal issue. I just dont understand why the tests are not showing any metals. What do I do now guys????? Do I continue to SLAM; alhtough I think I could pass the OCLT tonight. I am so furstrated that I want to cry and I just want to swim. I feel defeated and like I just want to put the cover on this thing.

    I have ordered the K-2006 kit for future use and I also went ahead and ordered 2 liters of Metal out and a culator (sp?) patch thingy for the skimmer. I did this because everything I have read indicated that the only reason my steps would turn that color would be metal. HELP!
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    20 X 40 in-ground, vinyl liner, 36K gallons, SWG, sand filter.

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    Re: Pre-SLAM help!

    Seems like you were in the middle of a SLAM and stopped posting and perhaps stopped the SLAM....Why?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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