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Thread: New to closing...

  1. Back To Top    #1

    Join Date
    Sep 2015
    Lindenhurst, NY

    New to closing...

    Hello, this is my second season with the pool. I have a 25,000 gallon vinyl in ground pool with a salt water generator (I am located on Long Island, NY if you need that info too...aka by New York City). I have used this site for many things. I bought the chemical test kit recommended and do all the test myself. I also use the pool calculator app so my readings are pretty much always where they should be. Last fall, the company that put the pool in installed and covered the pool since we also bought the looploc safety cover. They supposedly put winterization chemicals in but I was not around when they closed it so I don't know if they actually did or not. When the pool was opened in the spring it was extremely green with a lot of leaves in it even though there were no leaves when it was closed. We definitely need water bags to hold the cover down during windy days to prevent the leaf situation, but I was wondering what I should add chemically to try to prevent it from opening green. I have read your articles about how to close the pool but some people say to use the algicide, some don't. I've had people recommend the closing kits but they don't use swgs and the pool store told me to just use liquid shock. So, needless to say I'm not sure which direction to go in. Any suggestions would be greatly appreciated. Thanks in advance!!!
    25,000 gallon in ground vinyl pool, swg, DE filter, looploc safety cover

  2. Back To Top    #2

    Join Date
    Aug 2014
    Northern IL

    Re: New to closing...

    Close at water temp less than 60, and open at 60 degrees.

    Use normal chemical procedures for closing regardless of SWCG. Take FC up to shock level and clean lights. If you want to use algaecide, let FC lower, and then use polyquat 60 at visible algae level. Polyquat will lower FC, so wait 24-48 hours and return to shock level FC. Close.

  3. Back To Top    #3
    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: New to closing...

    When closed properly via Pool School - Closing an In Ground Pool, the chances of opening to a green pool are greatly reduced. This is for two reasons: The water temp is such (below 60) that it is difficult for algae to survive; and because the high FC should last much longer in the cooler water temps. The use of an algaecide (Polyquat 60) is simply "insurance" to help prevent algae. You will notice on the forum that some people use the Polyquat 60 every winter, while others never use it. Many find that the higher FC level is sufficient enough in the cold water to last through the winter. But if you do chose to use the Polyquat, make sure you allow the FC to lower about halfway from your initial SLAM level as noted in the instructions. Otherwise, too high on an FC level can break-down the Polyquat and reduce its effectiveness. The fact that you have a cover to help prevent leaves from falling in the pool is great and also reduces the chances of more organic material in the water. Hope this helps.
    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
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  4. Back To Top    #4

    TFP Guide

    bmoreswim's Avatar
    Join Date
    Jul 2012
    Central MD

    Re: New to closing...

    I'm 2 for 2 on clear water openings in MD with no algaecide. But I also will pop open and check FC in late Fall and early Spring. Adding bleach if necessary and stirring the water with my cover pump.
    18'x38' Rectangle (3'-8 1/2' deep w/ diving board) - 27K gal. w/ gray plaster
    Hayward equipment (cartridge filter, 2-speed pump, SWCG, automation) View Our Build
    Coverstar automatic pool cover | StoneMakers concrete retaining wall and decking | Merlin SmartMesh winter safety cover
    Spring 2013 Build | Dolphin Active 20 robot cleaner | Support TFP!

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