Algae an borates

[cschnurr]

I vaccumed the pool with the SWG on 100% for the entire day on Sunday.
I kept the pool at 20ppm on Sunday.

Sunday night, I turned the SWG off so I could monitor Cl consumption.
Sunday night 20ppm, Monday am 20ppm
Monday night 15ppm, Tuesday am 15ppm
Tuesday night 11ppm, Wednesday am (didn't measure)
Wednesday 7:00 (tonight) 8ppm.
Barely 50% drop over 3 days, I'd expect this consumption without algae.
SWG off the entire time. Weather was cooler High mid 70s and mostly sunny.

When I came home from work Wednesday, the water looked pretty clear from the back door, (Saturday before shock, it had a greenish tinge). But when I got closer, there were large deposits on the bottom of my pool (and a dead frog and mouse in the skimmer). I would have thought the deposits were algae, but is it possible it was dead algae?

I vacuumed the deposits to waste. The water looks pretty clear, I can read the 1/4" print on my vacuum in the deep end, no sign at all of any greenish tinge.

I test with a Taylor K2005 kit
FC 8-9ppm (measured twice: dilution 2:1 and 3:1)
CC (slight colour change but barely discernible)x3?
pH 7.6
TA 120
CH 280
CYA 80 (measured a week ago, but ran out of reagants)

As a sanity check, I also used test strips which are consistent with my measurements.

This may be totally unrelated, but last year I had a water bubble behind my liner in early August, and had an agae problem at the same time. There was no water behind the liner when I opened this year, but the water bubble is back again now and I have algae.


Any advice?