White stains on new construction (1 year) rock wall grout

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L

livermoron

Member
Apr 28, 2023
10
Livermore, CA, USA
I have this white residue building up on the rock wall grout, on our 1 year old pool. I was assuming it's calcium deposits, but I can't remove with anything so far. It's present on both retaining wall and non-retaining wall side of pool, so I don't think it's anything seeping through.

8:1 muriatic acid/water does nothing, no bubbling. Brushing with stainless brush does nothing. This stuff is hard!

My CSI is -0.18

Any suggestion appreciated!

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