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Our Pebble-Tec in-ground pool has four major stains that refuse to die. Two are definitely related to winter leaves, while two are mainly "where things died" (worms, etc.). They're brown to yellow-ish. There's no metal within a few feet of the stains. Overall pool chemistry is in spec. Ascorbic...

We have an ancient 180 (it's exactly as it came with the pool - if you ignore I've replaced most parts at one point or another) with a booster pump, of course. Somewhere in the Polaris docs it say something about never running the pump if the main pump isn't running. The pump - filter - pump...

(There a two threads about 0021 errors, but TFP policy basically says "no necro posting" Thread number 3 follows) OK, first time listener, first time caller. My Superflo is also giving err 0021's. I pulled the 5 pin connector, squirted contact cleaner, put the plug back and... no change. The...