Algae - Not sure if I messed up

[CarlD]

Those of us who have been adding DE to our sand filters recommend that you add a little at a time. Start with 1/4-1/3 cup, add it through the skimmer and wait 20-30 minutes. If your pressure doesn't increase by 1bl, repeat. Repeat the process until the gauge shows that 1 lb increase and that's the amount to use, however much it is. If the pressure goes up too much (like by 5lbs) you've added too much and the solution is to back-wash and start again.

How much will be right seems to depend on a lot of factors, including just plain randomness!!

[bigal]

I shocked the pool and thought I had all cleared up but the algae's coming back.

I'll keep shocking until its all gone again but a quick question, I noticed that the ph levels are creeping up, does this matter when you're shocking or should I put some ph down to get it back to normal range?

[Watermom]

You'll need to post some current water testing results taken with a drops-based kit for us to be able to advise you. Also tell us what type and volume your pool is and what size pump and type of filter you have. We also need to know exactly what all you have put in your pool --- meaning ingredients, not just "shock." Then, somebody here can try and help you.

[aylad]

When your chlorine level is above 10 ppm, the pH test can give false high results, so don't try to fix pH levels while shocking is in process. Sounds like you're either not shocking high enough for long enough to really get rid of the algae, or you're not maintaining high enough baseline levels of chlorine. As Watermom said, if you'll post your current numbers and what ingredient it is that you're using to shock, we can help you out.

Janet