I have read Stinky's tutorial on checking ph using runoff. I certainly have had my share of ph problems this time. When I discovered my tap was over 8, I flushed 4 gal with clearex ph adjusted followed by a 1/4 strength feed. But runoff is still dark..too dark to use the liquid ph tester with. So does this mean I need to flush until the runoff is more clear? Much thanks to any one who can help.