Maintain FC level

Welcome to TFP! :wave:

Please give us some more info to work with. Did you just open your pool after closing it for the winter? If so, there are several possibilities, but the solution is the same which is to keep adding chlorine until it holds. However, it would be a good idea to get a proper test kit such as the TFTestkits TF-100 and to post a full set of water chemistry readings. That will help a lot in figuring out what is needed. For example, if the Cyanuric Acid (CYA) level is very high, a partial drain/refill would be in order.
 
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