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Thread: Persistent cloudy water

  1. Back To Top    #1

    Join Date
    Feb 2008
    Charlotte NC

    Persistent cloudy water

    Thanks for any insight you all can give me on this puzzle. I've had this pool for 11 years, and this is the biggest water problem so far.

    This winter I didn't lower the water, just left the solar cover on and ran the pump when temperatures got below freezing. I planned to keep some Cl in the pool, but neglected it, and ended up with extensive algae, including enough biofilm to eat up all my CYA.

    Two weeks ago I raised CL to 16, removed as many leaves and debris as possible (couldn't see the bottom), added a bit of CYA, and made a halfhearted effort to clean the bottom of the solar cover. As per recommendations here, I've continued to add Cl to maintain shock levels and have run the filter 24x7. Still can't see the 8.5' bottom after 14 days. While there is some improvement - I can now see my brush when its about 7 feet deep, while a few days ago I couldn't see it at 4 feet deep - this cleaning process is far and away the most protracted I've encountered. I've never had to go more than 4-5 days previously to get sparkling water.

    Test results from last night, which are typical:

    FC 15.5
    CC 1.5
    Ph 7.5
    TA 90
    Borax between 30 and 50
    CYA - not registering, should be about 10 given what I've added so far.

    22,000 in ground pool, sand filter, vinyl liner.

    I have been removing the solar cover at night and replacing it during the day to keep Cl levels high.

    After the initial 24 hours the pressure in the filter wasn't going up to levels requiring a backwash. Nevertheless, I was backwashing approximately every 48 hours. The last few days I've added some DE to the filter, thinking there must be stuff in the water not getting filtered out by the sand. This has led the pressure to go up more quickly, and I've ended up backwashing about daily, but the cleaning process still seems awfully slow.

    What I haven't done:
    1) Throw away the solar cover. Perhaps I should, as the algae certainly had made a nice home for itself there. However, after 2 weeks the bottom of the cover looks pretty clean.

    2) Vacuum to waste. I know that can speed up such clean-ups. The last five years regular brushing has kept the pool clean, so I didn't replace my cracked hose.

    The persistent CC readings of 1.0 to 2.0 indicate there's more work for the Cl to do. So what do you suggest? Just stay the course and let the Cl work? Or try something else?
    22,000 gal, IG vinyl, 3/4 hp pump, 300lb sand filter (switched from DE), converted from baquacil (thanks to Ben), BBB since 2004

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Persistent cloudy water

    It sounds like you've been reading and paying attention. You've added DE and it seems to be working since it's causing pressure to go up. It sounds now like a circulation problem. Can you aim one of the eyeball returns down towards the ddep end to get that low-lying stuff stirred up so the filter can grab it? Do you have a main drain, and is it drawing water?

    If you're leaving the cover on all day, you're eliminating chlorine loss doe to the sun, but you're also preventing the CC from burning off. Most likely, if you left it off for a day, you'd pass the CC test. You still haven't passed "the water is clear" test, so keep it at SLAM.
    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!

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Persistent cloudy water

    You need to leave the cover off during the day. The CC will never clear if you continue to leave the cover on. Sunlight is an important part of cleanup up a pool.

    You need to raise CYA to at least 30, otherwise you will lose all of your chlorine to sunlight during the day with the cover off.

    The cover is probably clean enough to not be an issue in that sense.

    What is your CH level?

    You need to make a concerted effort to get everything off the bottom. That could involve vacuuming to waste, but doesn't have to.
    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

  4. Back To Top    #4

    Join Date
    Feb 2008
    Charlotte NC

    Re: Persistent cloudy water

    Thanks, Richard and Jason. Yes, there is a main drain, and it's working. The deep water doesn't seem to be any cloudier than the water in other parts of the pool - there's just more cloudy water to look thru to see the deep end.

    Per your advice, I'm leaving the cover off today. I was waiting until I wasn't backwashing frequently to add the CYA, but had forgotten about the CYA-in-a-sock trick until reading the Sticky. So I've done that now.

    With a vinyl liner, I've never bothered to monitor CH. Can't think of any possible source of CH that could have gotten into the pool since closing.

    I've swept and scooped the bottom of the deep end frequently. Though I'm working blind, I'm confident there's nothing substantial left on the bottom.

    Thanks again.
    22,000 gal, IG vinyl, 3/4 hp pump, 300lb sand filter (switched from DE), converted from baquacil (thanks to Ben), BBB since 2004

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