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Thread: Yearly algae problem again when opening pool

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    Yearly algae problem again when opening pool

    Just uncovered our pool again, and as we've had the last few years, we've got another problem with algae. The last two years, I've flocked the pool, but want to try to get away from it this year and try the BBB method.

    The pool is an inground vinyl pool, about 33,000 gallons. The sand in the filter was replaced this spring. The water is cloudy, and not able to see the bottom of the deep end (8'). I'm trying to vacuum the dead algae from the initial shock treatment.

    Values from checking the pool this morning are:

    FC ~ .5
    PH ~ 6.6
    TA ~ 60
    CYA ~ 10

    Should I add sufficient Borax and Baking Soda to get the PH and TA where they need to be before trying to add enough bleach to shock it, or add all three at once? I'll be continuing to try and clean up the dead algae.

    What is a good method to prevent this from happening during the times when the pool is covered?

    Thanks,

    Chip
    33,000 gallon
    sand filtered
    inground, vinyl liner pool

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    Join Date
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    Re: Yearly algae problem again when opening pool

    What kind of cover? A mesh safety covered pool should be closed a bit later so the temp drops since most let light in. Light + 60 degree pool water plus no circulation = algae.
    Owner of - PoolGuyNJ LLC
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    JasonLion's Avatar
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    Re: Yearly algae problem again when opening pool

    Raise the PH to between 7.2 and 7.4 first. You can't retest to see how your adjustment worked if you add chlorine, so do PH first.

    Don't worry about the TA for now, it is acceptable. You can fine tune TA later.

    Start raising CYA to around 30 before starting to shock.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Yearly algae problem again when opening pool

    Welcome to TFP!

    Were you circulating the water when you tested and got those numbers? Be sure and run the pump for about an hour before testing to makes sure that everything is mixed well in the water. If it has been sitting a while, it can really affect your test results.
    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
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    Re: Yearly algae problem again when opening pool

    Quote Originally Posted by PoolGuyNJ
    What kind of cover? A mesh safety covered pool should be closed a bit later so the temp drops since most let light in. Light + 60 degree pool water plus no circulation = algae.

    Yes, it's a green mesh cover. It was covered towards the end of September, just before the leaves start falling here in South Jersey.
    33,000 gallon
    sand filtered
    inground, vinyl liner pool

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    Re: Yearly algae problem again when opening pool

    Quote Originally Posted by 257WbyMag
    Welcome to TFP!

    Were you circulating the water when you tested and got those numbers? Be sure and run the pump for about an hour before testing to makes sure that everything is mixed well in the water. If it has been sitting a while, it can really affect your test results.
    Had run it for about 6 hours yesterday, backwashing as needed. It sat overnight before testing this morning.

    Will get updated results, add the borax and let run for a few hours before testing again this evening. Will post the results.
    33,000 gallon
    sand filtered
    inground, vinyl liner pool

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    JasonLion's Avatar
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    Re: Yearly algae problem again when opening pool

    With a mesh cover you want to close late and open early to avoid algae. Ideally you want to wait to close till the water gets down to 50 degrees and then open before the water warms up to 50 degrees.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Yearly algae problem again when opening pool

    Sorry for not updating earlier, I travel for work, and have been trying to have my wife keep adding the bleach after she tests and calls me with the readings. She's been questioning my sanity with the amount of dollar store bleach we've bought over the past week. We've filled nearly three trash cans with 3/4 gal bleach bottles. I had also added 7 boxes of Borax, 3 12.5 lb bags of baking soda, and 16 lbs. of stabilizer to get the PH, TA and CUY up.

    This morning I checked the pool and got the following results (with the pump running an hour before testing):
    TH ~ 200
    FC >= 10 (HTH sticks only go to 10, need to get a real kit).
    PH ~ 7.6
    TA ~ 100
    CYA ~ 30 to 50

    Since the CYA is in the 30 to 50 range, I've had my wife add enough bleach to get it up to an FC of 15. Haven't added anything else (since the dose of borax, baking soda and stabilizer early in the week).

    The shallow end (~42") of the pool is clear, just a hint of green. Just a few small bits of dead algae on the bottom. The deep end (8') is still tinged green, but still slightly cloudy towards the bottom (gets worse when vacuuming to waste). The bottom's been vacuumed to waste twice, and added water to replace what was lost. The sides were pretty clean, but I scrubbed them last night.

    While she's becoming a believer, her only concern is that adding so much bleach will whiten the liner. I tell her to stick with the plan, and as the FC stays stable, we'll start to lower the chlorine levels.

    Thanks again,

    Chip
    33,000 gallon
    sand filtered
    inground, vinyl liner pool

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    Re: Yearly algae problem again when opening pool

    Welcome to TFP!!

    Perhaps the info is here already, but I'll tell you how to, initially, deal with this

    When you open your pool and see it's a swamp:

    Add a good dose of liquid chlorine, with the pump on.

    BRUSH the walls and floor as completely as you can.

    The next day you want to kill the pump and wait until the green stuff settles to the bottom, then vacuum to waste. (keep an eye on your water level as you do this )

    I really should write a 'sticky-able' post about this - but, it ain't gonna be tonight
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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    frustratedpoolmom's Avatar
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    Re: Yearly algae problem again when opening pool

    The bleach won't harm the liner at all.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Yearly algae problem again when opening pool

    And next closing you will get all that closing stuff right, be reading up on that as you near closing time.
    19,800 gallons (closed/winter 18,654 gal); plaster; 18x34 Ft kidney bean shape, Depth 3Ft-5Ft. Built 1992
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    BBB (Hayward Chlorinator when leave town). Polaris 360 cleaner.

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    Re: Yearly algae problem again when opening pool

    Quote Originally Posted by Johnny B
    And next closing you will get all that closing stuff right, be reading up on that as you near closing time.
    Believe me, I plan to
    33,000 gallon
    sand filtered
    inground, vinyl liner pool

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