Good website with good background info. I witnessed struvites in my galley grey tank when I had it out to repair it. I almost never use anything in my grey tanks. I have also seen struvites flush out of the black tank when I am rinsing and it is easy to hear them as they rattle down the sewer hose. I use bio-active as my black tank chemical since it works well for me. This sounds like a good product and much needed for tanks that haven't had really good care. John
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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