Suzij11 Posted November 9, 2021 Report Share Posted November 9, 2021 So, trying to get the chemistry right my hubby put baking soda in our hot tub. Several days later. We had an entire film over the shell. We could scrap if off with our fingernails. So we assumed it wa the baking soda residue. We drained and cleaned, with vinegar and soft brushes and the refilled. Thought everything was ok. 2 weeks later, after we hadn’t used the tub, in a hit … same residue. HELP!! Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted November 9, 2021 Report Share Posted November 9, 2021 Baking soda raises ph, high ph causes calcium to come out of solution on surfaces (scale). Get the ph down and scrub it with a scrubby sponge and you'll be fine. Make the hubby do the scrubbing, it will help him remember next time.😉 Quote Link to comment Share on other sites More sharing options...
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