I have a white deposit forming in the grout lines only along side the waterfall. This is only happening were there is no standing or flowing water but area is wet from waterfall splash. It is only in grout line and nit on flagstone. It runs down out o grout onto tile.
I cleaned it off one by spraying with diluted muratic. It quickly came back.
What is causing it? Any way to stop it?
Ph: 7.6 (about to add acid to bring to 7.4)
ta: 60 (to low, I'm going to add baking soda)
ch: 290 (on the hard side but not too high?)