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I've noticed a little sand on the ground where I've backwashed (I've been back washing a lot). I also noticed some sand in my Polaris collection bag and a little in my skimmer baskets. Is this telling me something about my sand filter possibly? I have never changed my sand or added sand to my...

Does anyone know if it is possible to get a false low CYA reading? I just shocked my pool with more dichlor than I thought I needed and my pool is still light green. I did a chlorine test and it reads zero and I did a CYA test and it shows virtually none. My pH is about 7.2. Any ideas?

In case anyone is interested, I just bought a Polaris 280 on Amazon for less than $400. It is working great in my pool!

My IC 40 is reading "Low Salt". My test strips show that my salt level is fine. Based on the amount of salt I've added I think my salt level is good. I've take the IC 40 off and no scale buildup is visible. Pentair says to do the acid wash anyway and to have the water professionally tested...

Currently it appears my salt generator is reflecting a lower salt reading than the salt test strips I have on hand; approx. 500-800ppm lower. Is this common and typically which would prove more reliable?

Are there any pros or cons to keeping ones water level above the halfway point of the skimmer which seems to be the manufacturer's suggested level?

I was wondering if anyone could point me to an article or give advice on the frequency of backwashing. When I backwash my filter the psi reads 17. I have rarely, if ever, seen my psi reach 27 which seems to be the suggested psi for backwashing. Although around 23 or so I do have very dirty...

Scenario: My TA is on th low end at 60 and my Ph is 7.8. I add acid to lower my Ph and in so doing I lower TA below 60. I then add Baking Soda to raise the TA which in turn raises Ph which in turn causes me to add acid to lower Ph and thereby lower TA. Doesn't this become a circular??

Yesterday I added 13.5 boxes of Borax and 3 gallons of acid to my pool to begin my BBB. The Pool Calculator actually called for 3 gallons 3 quarts but I thought it would be easier to lower Ph rather than raise it so I shorted the acid. This morning I checked the Ph and it was high so I did an...

I put some D.E. in my sand filter this morning and when I got home today I could see a big difference! Thanks so much for the suggestion. I do have one question, I added the D.E. a little at a time until I saw a 1 psi increase in my filter pressure. I waited about 15 minutes or so to let...

I was going to add a littel D.E. to my sand filter to help with filtration. I went to my pool store and they sold me Celatom Diatomite. Is diatomite the same as diatomaceous earth? The back of the bag says "amorphous diatomaceous and crystalline silica in varying amounts."

After a bout with algae this winter my water is looking significantly better now. However, there still seems to be a little cloudiness that I notice at night when the pool light is on and when my cleaner is running. I'm thinking maybe the cleaner is stirring up something, possibly dead algae...

Does anyone know of a reasonably priced place to buy a Wall Whale Brush?

Is there a concern about water temperature when testing CYA? For that matter, is there a concern about water temperature with any test?

I ordered and got an individual chlorine test kit from TF Test Kits today. The kit seems fine although a scoop was not included. The instructions say to use two heaping scoops but again no scoop was included. It seemed to me that the scoop from my Taylor 2006 would probably work, but the...

Should I be able to turn my main drain off when vacuuming through a skimmer plate? My pump seems to lose prime when I do. I have two skimmers and vacuum through a plate into the skimmer basket and put another plate on my other skimmer and close it off. Usually the plate I am not vacuuming...

Is it common for pumps to lose prime when the water level drops below the skimmer and only the main drain is being used?

Could someone explain to me how the CSI section of the Pool Calculator works? Is it calculating what my CSI is "now" (left box) and what the "goal" (right box) should be?

I just went through a big battle with algae and now have a cloudy pool. I read in one of the "Pool School" articles that this would happen. However, my cloudiness seems to be going longer than was indicated in the article, i.e. a week. Could I have a different issue? My Ph is 7.5, FC is 28...