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    Are 12v lights safer than 120v?

    I am trying to decide between a Pentair Intellibrites 12v pool light with transformer vs. the 120v pool light. Code for my area requires 12v only for commercial pools. Are 12v lights safer?
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    New pebble calcium reading 1000

    My new pool was pebble plastered 4 weeks ago, but not acid washed before filling. The pool builder added some acid after it was filled and told me to brush it. I have had no instruction since then and I'm getting worried that I should be doing something. I bought a test kit and PH is 6.2; TA is...