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Thread: New pool owner - High CYA and algae

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    Join Date
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    Question New pool owner - High CYA and algae

    Hello! I'm excited about moving into a rental home with a pool, but have managed to turn the pool into a swamp in less than a month through my inexperience.
    IMG_1798.jpg

    Based on what I gather from Pool School, I need to drain the pool before attempting to fix the algae problem since CYA levels are too high to SLAM. The previous owner maintained the pool following advice from Leslie's and was using "Shock" on a regular basis.

    Results from TF-100 test kit
    FC: 1 ppm
    CC: 1 ppm
    pH: 7.5-7.8
    TA: 260
    CH: 800
    CYA: 180

    The pool calculator says I need to drain about 90% of the water to get CYA to the correct level. I plan on doing this all at once. The water tables in Escondido should be quite low because of the drought, and I'm on a hillside anyways.

    I am entirely unsure how to drain the pool: the valves and pipes are a bit intimidating. Should I just rent a sump pump from Home Depot, or is there a way to drain the pool without it?
    And once the pool is drained, what anti-algae actions should I take before refilling? Thanks for any help!

    IMG_1800.jpg
    15k gal, plaster, in-ground pool
    36 SF DE filter, Pentair Pinnacle pump, Century Centurion 1 HP motor
    California drought, no local pool restrictions (yet)

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    Mod Squad kimkats's Avatar
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    Re: New pool owner - High CYA and algae

    Hi! I am SO glad to see you have a good test kit! THAT is going to what helps you clear that pool up!

    You can rent the sup pump or you can get a cheap one from Harbor Freight. It is up to you.

    I am going to link you to how we do things here. You will see that we use the test kit and bleach! Those are the main two thing to get and keep a pool clear!

    Pool School - Recommended Pool Chemicals

    Here is how you are going to clear your pool after you drain and refill it!

    Pool School - SLAM - Shock Level And Maintain

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: New pool owner - High CYA and algae

    I am assuming you did a dilution test with 50% tap water and 50% pool water to arrive at the 180 CYA? If so, you can manage a SLAM with CYA Levels at around 50-60, but no more. At a CYA of 60, that is a 66% water replacement, not 90%.

    Because you have the recommended test kit, the SLAM will be a lot easier. Please post new results after draining water of where your CYA levels are and we can all go from there.

    You may want to do another CYA test with 2 bottles of tap water and 1 bottle of pool water. Mix it real well in a small bucket and test CYA again. You should be at around 60 ppm. This will confirm your initial testing.
    14,700 gallons IG Pool Vinyl Liner - Octal Circulation System
    Hayward Pro-Series 350 LB. Sand Filter Model # S270T - 2" Plumping
    Hayward CL2002 Chlorinator - Hayward Super Pump 2 HP Model # k48m2n111
    Hayward AQR9 SWG 25K Salt Cell & TF-100 Test Kit + Speed Stir
    Gulfstream HE125RA - 117K BTU Heat Pump - Date of Build is 11-2013

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    Re: New pool owner - High CYA and algae

    Catanzaro: You're correct, I diluted 50:50 to get the CYA reading of 180. I just repeated the test with 2 parts tap to 1 part pool water, and got test results of 60 PPM, which confirms the 180 reading for the pool. Should I aim for a CYA of 60? This pool receives sun most of the day. I was leaning towards 40 CYA.

    Kimkats: Thanks for the advice! I'll go with the Harbor Freight pump since a location is just down the street, and it may come in handy later. I'll stock up on liquid chlorine too to prepare for the SLAM. Any advice on what to do with three boxes(!) of powdered "Shock" the previous resident left me?
    15k gal, plaster, in-ground pool
    36 SF DE filter, Pentair Pinnacle pump, Century Centurion 1 HP motor
    California drought, no local pool restrictions (yet)

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    Mod Squad kimkats's Avatar
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    Re: New pool owner - High CYA and algae

    sell it???? LOL

    Let us know when the drain and refill are done. We will get you set up for a jewel of a pool!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    aboykin2269's Avatar
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    Re: New pool owner - High CYA and algae

    Nice looking pool. Can't wait to see it sparkly and clear!
    Ant
    16'x48" Summer Escapes Pro-Series, AG, Ultra-Frame, Intex CS15110 Sand filter/SWG, 5061 GAL, TF-100 Test Kit w/ K-1766 Salt Test and Speedstir.
    Pool School, ABC's of Water Chemistry, CYA/Chlorine Chart, Water Balance for SWG's, Pool Math.

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    Catanzaro's Avatar
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    Re: New pool owner - High CYA and algae

    Tally 324:

    Starting with a CYA of 60 is fine. Even 80 to start the SLAM is fine. The reason behind this is that your SLAM will start at 80 and as you backwash, remove and add water your CYA will be lowered automatically. while your are in the SLAM process, continue to remove and add water, including backwashing to get to the desired level. Because you will be backwashing frequent, sometimes your CYA is lowered too much and you will then have to add stabilizer. Lastly, you will loose about 2 ppm, per month during the winter months (at least that has been my experience). Maybe others can give you there experience. So finishing the SLAM with a little higher CYA will only correct itself to the level you are needing for the following year, but all up to you.

    I find that if a person waits that extra few days to start the SLAM, the pool becomes worse. If "Procrastination" sets in (wow, that used to be school), it takes even longer. The extra CYA only leads to a little for liquid chlorine for only a few days, which in turn starts the SLAM sooner, than later.

    Please note that it will appear that you may not be making progress in the beginning. Be patient. Sometimes people give up. Then one morning you will wake up and the water will look different. Keep a "timeline" of levels and additions, which includes time, etc. This way you can visually see your progress.
    14,700 gallons IG Pool Vinyl Liner - Octal Circulation System
    Hayward Pro-Series 350 LB. Sand Filter Model # S270T - 2" Plumping
    Hayward CL2002 Chlorinator - Hayward Super Pump 2 HP Model # k48m2n111
    Hayward AQR9 SWG 25K Salt Cell & TF-100 Test Kit + Speed Stir
    Gulfstream HE125RA - 117K BTU Heat Pump - Date of Build is 11-2013

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    Re: New pool owner - High CYA and algae

    An interesting note: There is a cartridge filter listed in your sig., but I see a plunger valve. Maybe you can use that to drain the pool by pumping out to the ground. That little blue hose piece is part of a backwash hose that has gone bad, but you could pick a new one up and then direct it where it might do some good.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Re: New pool owner - High CYA and algae

    After two days of draining and three days of refilling, my CYA is now at a manageable 50. I'll post full test results later, but I thought I would share the pool progress after two days of SLAM!

    Pabeader: After reading your comment, I realized that the filter is in fact a DE filter, not cartridge. I was able to drain the pool using the backwash hose, plunger, and pool pump (after repairing some cracked PVC.) Then I recharged the DE filter. Thanks!

    9/20: Before SLAM




    9/21: 24 hours after SLAM

    15k gal, plaster, in-ground pool
    36 SF DE filter, Pentair Pinnacle pump, Century Centurion 1 HP motor
    California drought, no local pool restrictions (yet)

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    Texas Splash's Avatar
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    Re: New pool owner - High CYA and algae

    Just two days? Big change already. Wow, that is going to look fantastic when it's clear. Very nice backyard setting.
    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.
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    Mod Squad kimkats's Avatar
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    Re: New pool owner - High CYA and algae

    Oh yea!!!!!!!!!!!! NICE job so far!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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