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I just drained and refilled my pool after doing an ascoric (and citric) acid treatment to help remove some metal stains. Some stains remain, but things are much better, and today, the water itself appears to be very clear. I added a sequestrant at the start of refilling and then kept adding a...

I have been experimenting with my pool, probably more than I should. Recently, I let the PH go below 7, which was a big mistake. I mobilized a lot of previously plated copper on my pebbletec. Bringing the pH above 87 caused much of the copper to replate on the pebbletec. I am not using a...

Hi, I am tinkering with a method of removing CYA without draining. It is different than the current methods, such as RO and microbes. I am not in the pool business, but I do own a pool and have a good background in the appropriate water chemistry. I was wondering if anyone had any data...

I have a very large spa that takes a very long time to heat up. The deep end is six feet deep and the shallow end perhaps just about three feet or less. Cold water from the bottom of the deep end travels via the bottom drain to the pump/filter/heater. The heated water is returned to the...

I am trying to figure out if about 900 to 1000 RPM is really the best RPM range for maximum efficiency in terms of gallons pumped per kwh of electricity for an Intelliflo pump. I tried to gather some data from my system and got about 35 GPM (calculated from XLS spreadsheet) for 800 RPM and 116...

This question has no real practical use, but I will ask it anyway. I have used small DE filters for fish tanks, and it is necessary to recirculate the water in the filter a few times to build up the "filter cake" before the water becomes clear. This seems reasonable to me, as the filter mesh...

I am trying to figure of what intake hose sizing I may need to a pump that pumps at much higher flow rates than normal pool pumps. The pump is to be used to basically empty the pump, such as a gasoline powered water pump. I may need to run a long length of suction hose to accomplish what I am...

Apparently, it is difficult to separate out the Calcium from Magnesium hardness levels on the titration tests. I have purchased the Hach and Taylor tests and I think one other titration test for magnesium only. The hardness test should measure the combination of Calcium and Magnesium. The...

First, I hope that I can actually ask this question in a somewhat coherent manner. I am wondering what gets measured when I go to the pool store and ask what my salt level is at. They are clearly just using something that measures conductivity that presumably all ions contribute to. Or, is...

I think that I saw an equation by chem geek, or someone else maybe, when I was looking at old posts. Now, I cannot find. I am looking for the equation for figuring out the concentration of a pool chemical, CYA in my case, as a function of the volume of pure water added to a pool. This might...

This is my first post on TFPs, so I want to thank all of you for making this a great site. A few patents call out the use of activated carbon to adsorb cyanuric acid (CYA) from pool water. I think this is expensive, but might still be useful to take out small amounts of CYA and at least...