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I have used it. It works very well used the whole bottle to reduce 2ppm of phos. It is not 100% reef safe despite what others say.
Urchins and starfish become stunned. Tube worms are retracted and some fish beath rapidly. However, a drip system would minimize theese effects slightly.
I would invest into somthing that works without large side effects like gfo.
I wrote a review, wich i cant find about it. And an alternative source of this in a huge bottle for cheap! I use it now. Search for it.
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Its a good idea to have a refrence sample for alk test kits. 1.1350 grams of baking soda in 1gallon of distilled water=10dkh. Check your alkalinity test kit!
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