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Thread: How to transition to liquid chlorine with high CYA levels

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    How to transition to liquid chlorine with high CYA levels

    My current CYA level is 90 due to the use of Pro Team High Tech chlorine tabs. I would like to switch to liquid chlorine for the duration of this swim season (beginning of October) without draining 1/3 of the pool water. Can I switch to liquid chlorine now with high CYA levels? How much extra chlorine (and how often will I need to add it) will I need to use now if I do not drain 1/3 of the pool until October?
    I live in the Albany NY area. The size of my pool is 24,000 gallons. The pool is an In-Ground rectangular Double Roman with a vinyl liner. I am using a Taylor K-2006 water testing kit. I have a DE filter. I have a regular chlorine pool. The pool cleaner is a 2017 Dolphin Premier Robotic In-Ground pool cleaner.

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    Mod Squad JVTrain's Avatar
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    Re: How to transition to liquid chlorine with high CYA levels

    You'll need to maintain the proper FC for your CYA level which you can find here Chlorine/CYA Chart. You can certainly maintain it over the short term but it's not quite as cost effective. Your minimum FC looks to be 7 with a target level of 10. You'll have to add as much bleach/liquid chlorine as it takes to keep it above 7 at all times based on how much you lose per day. I'd bump it to 12 once you start using liquid and see how much you lose each day and go from there. As an example, you'd need 149 oz of 12.5% bleach to go from 7 to 12 FC. The Chlorine/CYA chart plus Pool Math will tell you all you need to know to maintain as long as you're currently algae free.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Re: How to transition to liquid chlorine with high CYA levels

    Thank you.
    I live in the Albany NY area. The size of my pool is 24,000 gallons. The pool is an In-Ground rectangular Double Roman with a vinyl liner. I am using a Taylor K-2006 water testing kit. I have a DE filter. I have a regular chlorine pool. The pool cleaner is a 2017 Dolphin Premier Robotic In-Ground pool cleaner.

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