Patent ID: 9637711
Date: 2017-05-02
CPC Classifications: C02F,C11D

Claim:
1. A dry composition for use in removing surface contaminants from filtration media contained in a water filter media bed, the dry composition comprising: a granular acid component comprising sodium bisulfate; and a granular oxidizing component comprising at least one of sodium percarbonate, sodium perborate, potassium percarbonate, or potassium perborate; wherein the dry composition comprises at least one of the following features (i) or (ii): (i) a pH indicator component arranged to exhibit at least one change in color responsive to change in pH within an acidic pH range; or (ii) the dry composition comprises at least 80 wt % sodium bisulfate and at least 5 wt % of at least one of sodium percarbonate, potassium percarbonate, potassium perborate, or sodium perborate.