It may just not have dissolved, but it could be other things, as well:
- How did you add it?
- If you put it in via the skimmer, did you clean the filter within the 72 hours AFTER you added it?
- How many hours per day is your pump on?
- What -- mfg & EXACT product name -- did you add?
- How did you test? ('Guess-strips' are bad at best, but when testing stabilizer, they are at their worst!)
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