I bought my first bottle of this conditioner from my local pet store and everything was fine. When I first started using this new bottle, a day or two after the water change, my aquarium became cloudy and quickly deteriorated. I couldn't figure out why, so I searched the internet and overheard another faucet owner say she had the same thing happen to her all along and finally found that her water conditioner had expired. My bottle has an expiration date of 11/2018 but I was still suspicious so I poured a few tablespoons into a clear glass and held it up to the light and sure enough I saw tons of particles floating in the solution. I can't say for sure this was the problem as my fish died before I could test another bottle but I definitely don't trust that.
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