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That 90 CYA reading from a month ago was not right. I was stopping the test when the dot started to disappear, not when it had completely disappeared. Doing the test correctly showed that it was between 70 and 80. And shortly after that post (after reading about how difficult it can be to...

I don't have a pool cover, and I did a thorough job of brushing, but I hadn't considered the pool light. There is some discoloration on the inside of the light cover. I won't be able to tell whether it is algae until I get it apart. I'll disassemble it, clean it, SLAM again, and then raise the...

I am not sure it is algae, but it looks like algae. Are there other microorganisms that can cling to pool surfaces the way algae does? It isn't something just settling in the pool (like pollen, for example), because it clings to the sides. There is pretty good circulation throughout the pool...

A few weeks ago, I came home from a trip to a pool full of algae. I slammed it according to the TFP method, which seemed to work. However, about a week ago, the algae came back. I slammed it again, this time being much more careful and frequent with my chlorine measurements. Three nights ago, it...

My original post said 1 liter. It was supposed to be 10 liters (I have corrected it). So the savings are more substantial. Basically, $45 would buy 10 liters of deionized water and 15g of ferrous ethylenediamine sulfate, and would make about 340 ounces of reagent, so the cost would be about...

Has anyone tried making the R-0871 reagent at home? I can order deionized water and ferrous ethylenediamine sulfate from City Chemical or Fischer Scientific, and it would be a lot cheaper than buying the Taylor reagent. My preliminary calculations (admittedly based on a guess about the molar...

Thank you.

When I do this test, the instructions for the Taylor 2006-K test kit say to add the cloudy solution to the tube until the black dot "just disappears" when viewing from the top. Does "just disappears" mean that the dot starts to become difficult to see, or that it stops being visible at all...

I am curious as to whether anyone has stumbled across this article, and what anyone might have to say about it. It seems to say that SLAM shouldn't work. Is Superchlorinating The Best Way To Eliminate Chloramines? - AQUA Magazine

I haven't really been keeping track, but I will start. I'd say I add about a half a gallon to a gallon of the 10% bleach in a typical week. My CYA is at currently at 80, although every time we have a heavy rain, I drain a couple of inches, so it is going down gradually. I try to keep my FC...

Thanks for the prompt reply. I currently test the chlorine every other day or so. If it is low, I use the pool calculator to decide how much 10% liquid bleach to add. The problem is that if we leave for more than a few days, we invariably come back to algae. I used to use a floater with chlorine...

I am considering installing a Stenner pump (or a similar apparatus) to continuously add chlorine to the pool. My wife and I take frequent trips, and I am tired of coming home to algae. I am in southwest Florida, which means the pool gets a lot of intense sun. It is about 12,000 gallons and has...