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I have a problem with my pebble finish - random dark spots on the bottom, which looks like pebble discoloration. I think I've had this for a while, but I believe it became worse recently with more darker spots appearing. I've attached a few photos if that helps. Here is my TF-100 results: FC...

I'm a fairly new pool owner and recently switched from using Trichlor tablets to HASA 12.5% liquid chlorine. Reading through the forum, I've discovered that most people here add chlorine either by pouring it slowly in front of a return jet or adding it directly into a skimmer. What about...