1. Get a cheap local OTO/phenol red testkit (yellow / red drops), use it, and report results.

2. Also, report whether the green is from algae or well water.

3. Meanwhile, if the side walls feel the slightest bit slippery, begin adding 2 gallons of PLAIN 8.25% household bleach EACH evening. Repeat EACH evening till no slipperiness is felt. Skip the day's dose if OTO shows an ORANGE color.

4. And, add borax till your phenol red drops show a pH between 7.2 and 7.8

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