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Thread: Raising free chlorine level

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    Join Date
    Apr 2017

    Raising free chlorine level

    Hello! This is my first pool. It is an 18' round above ground. Sand filter. Filled the pool in mid April, I live in Pennsylvania so we've had some warmer than usual days, but recently below average. About two weeks ago, my ph needed to be increased and also the free chlorine. I added the recommended solution from our pool store and then shocked the pool. Everything was good for about a week. Now the free chlorine is low again, but everything else is good. I have a floating chlorinate. Do I have to shock again? Or should I be adding my chlorine in another way? Thanks in advance!

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    TFP Guide

    AimeeH's Avatar
    Join Date
    Apr 2012
    Columbia SC

    Re: Raising free chlorine level

    Hi and welcome to TFP

    How are you testing your water? We reccomend testing with a good home drop based test kit. Like these

    Pool School - Test Kits Compared

    Also, have you had the chance to look at any of the articles in the Pool School link at the top of the page? By using a chlorinator with pucks, you are also adding CYA which can get too high over time and make your chlorine much more difficult to manage. Here is a link to some basics.

    Pool School - ABCs of Pool Water Chemistry
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.

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