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Clarifier is not a recommended chemical for use in a TFPC pool.
With a 1200 gallon pool, dump it and start over.
Smaller seasonal pools can see just as much enjoyment as their larger counterparts. In this guide we'll show you how to maintain your temporary pool.
www.troublefreepool.com
I suggest you read through
Pool Care Basics - Trouble Free Pool and even look at a few of our videos
TFP-TV - Trouble Free Pool