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Thread: Pool completely green - nothing has helped!

  1. Back To Top    #1

    Join Date
    May 2016

    Pool completely green - nothing has helped!

    20k inground pool.

    Since opening, the pool is completely green. I shocked the heck out of it, for days now. No change.

    It has only about 3-4 ft of visibility.

    I added 8 gallons of shock (12%), just yesterday. The day before, 4 gallons of bleach. 10 bags of powdered shock in the last week.
    Ran filter 12 hour runs, then even 24, backwashing the sand filter every few hours or in the morning if I ran it overnight. Still, NO change. Chlorine feeder (in-line) is maxxed out.

    I've got the Alkalinity correct, and the PH, and chrlorine levels are very high, STILL, no change.

    I'm starting to think it's not the chlorine, and but the filter is NOT filtering the algae.

    I read that dead algae is brown or grey, but this isn't happening. No matter how much shock I put it, the pool is still green. There doesn't seem to be algae growing on the walls, just in the water.

    I moved here only 2.5 years ago and have no idea how old the sand filter is, or if the sand needs replacement. Should I replace the sand anyway for better filtration? I didn't have this problem in previous summers.

    When I backwash, you can see a lot of green coming back out, but the water color, if anything, got WORSE by this morning (in the pool), after 8 gallons of shock, and running the filter for 24 hours (including at least 4-6 backwashes).

    I'm at my wits end here. Never had a problem like this that wouldn't clear up in a week before.

    Any ideas?

  2. Back To Top    #2
    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Columbia, SC

    Re: Pool completely green - nothing has helped!

    Welcome to TFP!!

    Filters don't clear algae. Never have, never will. Stop thinking about the filter. The sand when new was already millions of years old, it doesn't wear out. You gotta kill the algae, kill it dead.

    My first suggestion is to stop going to the pool store. Their only response it to sell you something, like the powdered shock that is doing more harm than good.

    I will tell you, it didn't turn green overnight and it will take time to clear. But, we can teach you how to get it sparkling and keep it that was for a lot less money than the pool store.

    Not much credence is given to pool store testing around here. While you would think that a "professional" would be the best, unfortunately in most cases it is quite the opposite. Between employees who blindly trust the word of chemical sales representatives and high school kids working in the pool store for the summer you end up with poor results from their testing. But, what can you do?? We base our pool care system on accurate testing and only adding what the pool needs, when it needs it. To do that you need your own accurate test kit. Order a TF100 and at least include the XL option. That will give you what you need while you are clearing the pool, and probably enough reagents for a couple of years normal use.

    While you wait for it to get delivered, you have a homework reading assignment. Start with ABCs of Water Chemistry and Turning Your Green Swamp Back into a Sparkling Oasis
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

  3. Back To Top    #3

    Join Date
    Jun 2015
    East Hampton CT

    Re: Pool completely green - nothing has helped!

    Is your in-line feeder using tablets or is it a liquid feeder? If it is the former, I'd say it's not doing much good in getting your chlorine to the appropriate level to get in front of the Algae bloom. They don't seem to dissolve very quickly. Stick with the liquid "shock." How quickly did you add the Chlorine? If I venture a guess, you were probably maintaining a certain level, but not nearly high enough, depending on how fast you added it. Also, how old was it and how was it stored?

    A proper test kit is essential. Once you have your test kit, post a panel of results. In the meantime, get familiar with Pool School and SLAM procedures, including the links that Tim has posted.
    17' x 35' outdoor in-ground Grecian shaped w/ vinyl liner. ≈ 21,000 gallons. Hayward S-200 Sand Filter and 1 HP Hayward Super-pump. Other Accessories: slide, light, ladder, fiberglass stairs, TF-100. Baquacil Conversion - June 2015, SLAM How-to, Chlorine/CYA Chart

  4. Back To Top    #4

    Join Date
    Jan 2015
    Bunbury, WA, Australia

    Re: Pool completely green - nothing has helped!

    You have a classic case of merry-go-round pool chemistry. As Tim has mentioned above we rely on accurate testing from a recommended test kit. You can then work out what is happening with your pool.It is likely that you are going to need to SLAM the pool -the key is to hold the shock level of FC based on accurate test results to clear the green. It is a process of regular chorine additions rather than a mass dumping.
    11 000 gallons, IG, Fibreglass, Monarch Sand Filter, Davey Typhoon C100M 1HP pump, Davey Chloromatic Mc16CTO ESR SWG, Davey Pool Wall Climba Robot, Daisy Solar Cover,

  5. Back To Top    #5
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Pool completely green - nothing has helped!


    Does your pool look worse than this?

    Here's the After shot

    Just do what he did. There are many other good picture threads in Recovering my old inspirational links If they can do it, you can do it.
    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!

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