Green Water - Algae?

[donovan.lambright]

You're right, I misread the question. I shocked the pool with liquid bleach last night. This morning, the FC was 16 ppm. The water is still greenish and there is a yellowish layer of something on the bottom.

[PoolDoc]

Keep it high, and BRUSH it!

[donovan.lambright]

Will do.

If this is algae, I'm puzzled as to what happened. I opened the pool using liquid bleach and only switched to trichlor after the FC levels were established. I checked it at least once per day and it never got below 4 ppm. Mostly, it was in the 6 to 10 range. What am I missing?

[PoolDoc]

There is another possibility. If the tablets had copper in them, copper can stain filters bluish green, and sometimes color the water. If you post a picture -- just supply the link -- to Flickr, Facebook, Webshots, whatever, I can probably tell the difference between algae and something else. If you use Facebook or some similar services remember to make the picture visible to the "world".

[donovan.lambright]

Here's the link. Took this a couple of hours ago.

[PoolDoc]

DEFINITELY, algae!

Add 2 gallons of 8.25% bleach, tonight if possible.

Get cheap OTO kit and test chlorine following night. If OTO light yellow, add 2 more gallons; medium yellow, 1 gallon, DARK yellow to ORANGE, 1/2 gallon.

Continue dosing nightly until pool has no green!

[donovan.lambright]

Add 2 gallons of 8.25% bleach, tonight if possible.

Done.

Still at a loss to understand what happened. I have the Taylor K-2006 kit and have been testing daily (sometimes twice a day). I'm pretty certain that I've been doing the FC, CC, and CYA tests properly but I can't think of any other explanation for how algae could have started when I've maintained (or so I thought) pretty high chlorine levels all summer.