Nettie Posted February 16, 2021 Report Share Posted February 16, 2021 New in ground spa installed in the fall. Getting build up right under concrete coping. Is this calcium deposit from the water, even though it’s above the waterline? Or efflorescence from the concrete coping? Or something else? How do we treat it and how do we prevent it? Thank you! (We use bromine sanitizer. Keep the balance within LSI range using a Taylor test kit and their app. Our ph runs a bit high and our TA a bit low. Trying to tweak it in closer leads to never ending seesawing. I’m including the latest run of test info. The jump from 170 calcium to 250 was because I tested it. It’s the one parameter I don’t test each time and just use previous numbers.) Quote Link to comment Share on other sites More sharing options...
Nettie Posted February 16, 2021 Author Report Share Posted February 16, 2021 I’m sorry for the sideways and upside down pictures. Not sure why that happened! The builder also never caulked this crack and said it wasn’t needed. Feels unfinished to me and I worry about water going in through there and behind the spa. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted February 16, 2021 Report Share Posted February 16, 2021 I'd say it's calcium leaching from the concrete coping and mortar. The uncaulked line is actually letting water out before it goes behind the spa. You can clean it off the tub with muriatic acid and water. 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.