Bandito Posted January 21, 2013 Report Posted January 21, 2013 How do you safely clean off calcium build up off of the interior of an acrylic spa and waterfall area without scratching it? Quote
Spa_Guru Posted February 26, 2013 Report Posted February 26, 2013 Odds are it isn't calcium, it is alkalai. The simplest method is to raise the water level of the spa above the area with deposits and add a cup of dry acid to the water, wait overnight, and change your water. Quote
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