I think it is algae now....

[smallpooldad]

Aylad, is correct the pH adjustment for each 100 oz of 5.25% Chlorine in a 10,000 gal pool is only about 0.15 pH to the up side , assuming a rise from FC 2 to FC 15, using 5.25% liquid chlorine, the pH would rise from 7.8 to about 8.3 pH.

As chlorine does work better at a lower pH it might be better to lower it some. For the sake of safety as it seems you are a little unsure of the accuracy of your test kit and starting this late you may want to use half the amounts recommended in my previous post. This should give a generous safety margin.

For the sake of interest chlorine concentration at a pH of 7.5 is approximately 50%, at a pH of 8.3 it is in the area of 15%, so you would need a lot more chlorine to do the job. See here:

http://edis.ifas.ufl.edu/EDISImagePa...RE%201&credits=

In fact generally speaking it is always a good rule when maintaining the pool, to use half the amount of muriatic acid mentioned and then re-check 4 hours later. In this case unfortunately one cannot check as the pH cannot be measured.

I do not know how accurate the Wal-Mart kit is, but the Taylor kit is considered by many to be accurate, so you might want to consider buying it.