sounds like your making progress. I have an hth drop kit, and it says that the test is supposed to turn red to indicate the presence of calcium. I'm guessing yours is 0 since it stays blue. I've read here that with a vinyl liner, you don't really need to add cal to the pool. I'm sure one of the more knowledgeable folks here can verify this.

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Thank you, Thank you everyone! Just wanted to let you know that we have crystal clear water!
I am still wondering about my TH test...it is blue at the outset (kit says it should turn red if hardness is present, then drop count to red). I wondered about the health of the reagent, so I tested my well water and it reacted as the kit said it should. Any explanation here? I'm concerned because the next step is hooking up a new electric heater....
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