I ended up at 80ppm of borates, either my pool is smaller than I calculated or the 2 boxes I put in when I opened it didn't dilute as much as I expected. More likely it's a combination of both. It's a freeform pool and only has 1 side that's straight, it's has curves around the rest with 4 steps in one corner and about 20 total feet of seating. I calcu-guessed 20,000 gallons, but it may be as small as 16,000.

Anyway, after vacuuming to waste this morning, the pool looks as good as it ever has. I haven't found a 300w floodlight bulb yet, so the light housing is still sitting on the deck.

It may be the higher borate level was the reason for the results against the mustard algae. But, I'm no chemist, you guys lose me at times.