thanks - I've tried to enter the pool info twice now and get the message below:

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The first test results in my post were from the pool store. In addition to strips, I have the two-way drop test kits, but it doesn't read up to 20ppm. I have two types of strips (one for separate hot-tub) and both sem to give same results for alk. & ph.

The algae seems to be dead since it's not green anymore, just the milky white. Could that be from adding calcium and alkalinty too close together?