Answer
No — water should still be drained from tanks and filters regularly; FSII only prevents the remaining traces from freezing.
Detailed question
Does FSII replace water draining?
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RXSOL CHEMO PHARMA International Navi Mumbai, India
Try "boiler water treatment", "tank cleaner" or a chemical name such as "citric acid".
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No — water should still be drained from tanks and filters regularly; FSII only prevents the remaining traces from freezing.
Does FSII replace water draining?