Green Algae

[argekay]

Hi-

I have a 25,000 gal. inground concrete pool. Opened up to a swamp 3 weeks ago. My pool water is now crytstal clear except for some small areas on the bottom which have geen algae growth. I keep brushing these areas and my pool filter is run at least 6 hrs./day. I have repeatedly shocked my pool (sometimes with bleach, other times with dichlor), and used a non-polyquat algecide, but all to no avail. I don't think I am adding enough bleach for shocking. I usuall add 6-7 jugs of 6% bleach in the 1.42 liter size. I add this shock in the evening. Can anybody help with the amount of bleach to add?

Here are my chem stats as of this morning:

CH: 300

TA: 110

Cya: 50

PH: 7.4

FC: 1.5

CC: 0

Thanks in advance!

Ray

[argekay]

Sorry about the typo-

I am using 1.42 GALLON jugs (182 oz.) when I shock.

ray

[chem geek]

The Pool Calculator and Defeating Algae.

[PaulR]

What chem geek said. The Pool Calculator says 6 jugs of 6% in 25k gal adds FC 28, which is more than enough for shocking; and you're losing all that overnight. Test your FC/CC an hour after you add the bleach in the evening, and again first thing in the morning; you aren't done until you lose no more than 1ppm FC overnight, and CC not more than 0.5.

--paulr