Hi, DR,

Yeah, I understood what you were saying and my post was not intended as a criticism of yours....DE added to sand apparently has merit in some special situations.

My intent, rather, was to remind newbies and semi-newbies of the basics that work consistently. Exhaust the use of those basics (including POP) before heading to the pool store for the "magic" ingredient.

Some time ago, there was a poster here who had an algae bloom for around 45 days....due to improper use of chlorine.

Finally getting the chlorine up to the correct level, the poster simultaneously ran out of patience and bought clarifier. Pool cleared up and the poster was completely and totally convinced he/she had found the solution to algae......Clarifier!!!