If you lower the pool's pH below 7.5 and if it look like it gets clearer, then it's likely to be copper though I don't know why the pool store didn't...

Can I add the stuff to raise the PH, and the CYA at the same time? Thanks

The advice on a better method of testing is the first thing you should follow.. also when you closed the pool, did you use a copper algaecide to...

You can use an algae brush (metal) to brush the spots. That should take the protective outer layer off and then you can rub with the tabs.

You can...

Test your water for manganese. Manganese causes purple water and staining.

I would think your pool should have lost more water, maybe your pump basket is full or the impellor is clogged with crap? sometimes you can get a bit...

The 3B's do work! 8)

And net some more. :lol:

If you have a sand or DE filter put your multiport handle on "waste" or "drain" and vac the pool as u normaly would.. All the...

Stop using chlor brite!!!!! Unless you have a pool using an ionizer or you use pristine blue anything with dichlor on the label is no good!!!! YOu...

You really need to get your own good test kit such as the Taylor K-2006 kit you can get for a good online price here or the TF100 kit you can get...

If the pump isn't running, then localized growth of algae can end lowering the chlorine concentration in that area to the point where the algae can...

Read this sticky .

You can use chlorine to clear your pool. Read this sticky on how to clear a pool of algae.

It all depends on price. Chlorinating liquid (usually 10% or 12.5%) and unscented bleach (6% Clorox Regular or off-brand Ultra) are identical except...

Once you get the water tested you'll have a better idea of what needs doing.

Keep at the leaves and get those all cleared out.

Depending on what...

If you added chlorine and it is still green, even getting more intense in color, then this sounds like copper, possibly added from the algaecide you...

Post your numbers. :wink: We can only sit here and wonder...