To go away for a few days, you'll need to let your chlorine drop to less than 5 ppm and then add a large treatment dose of polyquat. Once you are ready to leave, put your filter on "Circulate", not filter (polyquat comes out on the filter) and add 2x the regular TREATMENT (not maintenance) dose.

That will *probably* take care of it.

If you want to go a step further, you can take your borax level to 50 ppm borates, which will add a permanent algaestat to the water. To do this, buy 10 boxes of borax, and 3 gallons of muriatic acid. Add 8 full boxes of borax -- slowly in the skimmer, pump on, followed by 1 1/2 gallons of muriatic acid.

When adding the acid, wear glasses and gloves, and watch out for the fumes. Make sure the pump is on, and do NOT pour more than 1/2 gallon in a single spot. Submerge the jug partly into the pool so you can pour with the lip only a few inches from the pool surface.

Wait 2 hours, and then test pH. You'll probably need more acid. If the pH is above 7.8, add 1/2 gallon doses. If it's below, add 1/4 gallon doses. Adjust the pH to ~7.2

If you do the borax -- and it's probably a good idea -- add the polyquat AFTER you finish the borax. But, you can go ahead and do the borax while waiting for the chlorine to drop.

Lemme know how it goes.