Bought a huge thing of it a couple yrs ago. Expiration says 7/16. Still works but can I trust the results?
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What happens to the liquid? It still dilutes the pink.
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Is it ever common to get a high CYA reading immediately after an add, only to have it come down to a more predictable level a week or so later? I was very surprised by the 50-60 reading I got right after the add given the amount of CYA I added (3 lb to a 30k pool with a start of 20 CYA). So the 40 I'm getting makes a lot more sense. I was basing my SLAM levels on the 50 but my results (18 days and counting) have been very poor thus far.
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Starting at 20 ppm CYA and adding 48 oz gives you an ending 32 ppm CYA. There is no explanation for how you tested and got 50-60 or how you are getting 40 right now.