Green Water - mustard algae

[SAP_Pete]

Thanks, I'll try and keep the chlorine up for a while. I have a cartridge filter with 4 cartridges, cleaned it yesterday. I just got a K2006 this week, so that's where I got my numbers. The pool stores around here don't have any decent test kits (but that's normal I guess).

[Watermom]

Sounds like a plan. Let us know how it is going!

[SAP_Pete]

Been on vacation and incommunicado for a while.

Pool has cleared up, but otherwise the numbers are much of the same.
Losing 4-5 ppm FC over night
CYA is 150ish, although 90% of the water had been changed, with no trichlor / cya added since. 2006K onlye goes to 100, and it's a bit higher. The test strips I bought before getting the 2006K show about the same.

CH was still at 140. Added 4 pounds of calcium chloride (DrivewayHeat) to get started on this.

[PoolDoc]

If you haven't yet, read the Best Guess page, linked in my signature block. Very relevant to your situation.

Maintaining correct pH and reasonable calcium levels IS important with a concrete & plaster pool.

Mustard algae takes HIGH chlorine (per Best Guess) + mechanical cleaning (brushing) + time. Often, you can't completely eradicate it, only keep it under control.

[PoolDoc]

Membership upgraded.