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Depending on storage conditions, reagents should last two seasons. The R0870 powder and the pH reagent are the most susceptible to storage degradation.
Refill sets are available from TFTestkits.net. Each spring, they put refill kits on sale.
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
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