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14 ppm FC with 100 ppm CYA has the same active chlorine (hypochlorous acid) level as 4.3 ppm FC with 30 ppm CYA or 0.13 ppm FC with no CYA. You would not notice ANY difference between any of these three since the effects on swimsuits, skin, and hair are only from the active chlorine as is the...

Most pool services use Trichlor pucks in a floating dispenser or in-line chlorinator (unless the pool has an SWG). To prevent algae growth, they use other means such as algaecides (linear quats or Polyquat or copper ions) or phosphate removers unless the pool is lucky enough to be poor in algae...

NSPs have no disinfection at all, but control bacteria and algae through low phosphate levels and filtration through an aquatic plant system. So this lagoon system has more disinfection since they do essentially add a disinfectant for 4 hours every 48 hours at a minimum. This will kill off...

"But the multinational company would rather you not call them swimming pools." There's a reason for that. If they were swimming pools, then they would have to meet commercial/public state regulatory standards for disinfection and water quality. These are more akin to Natural Swimming Pools...

Most of California does not get summer rains; we have dry summers. At this point it's conservation (some of it mandatory) and the hope that this winter with El Nino brings higher than average rain and snow.

See this thread. There was an outage and it's being worked on. Possibly a hardware issue and a new server is getting put in and switched over, probably tonight or early tomorrow.

I'm glad it worked out and you are lucky they took it back since some stores will not take back chemicals, even if unopened. It's interesting that she liked the smell of Trichlor tabs since they smell much worse than bleach because they produce a little nitrogen trichloride that is very smelly...

The PoolForum is back up. No explanation for why it was down for so long.

No, it's not good. The good news is that swimming pools themselves are not the biggest problem, particularly if they are covered. The amount of water loss from uncovered swimming pools is roughly the same as that from lawns. The rate of loss from covered pools is much lower than that of...

The number of people on the forum from each state roughly corresponds to the number of swimming pools in each state. According to Quantcast which measures traffic, there are more uniques (cookies) from California, then Florida, Texas, Arizona, New York, which makes sense given the populations...

It's hard to know how much is needed because for disinfection you want a certain amount of time at a certain active chlorine level. The problem with laundry is that there may be many organics or other substances for chlorine to react with so that the chlorine level gets to near zero. Also, the...

Roughly speaking, chlorine reaction rates vary by a factor of 2 for every 13ºF temperature difference. In my pool at 88ºF, if the opaque cover is on all the time the chlorine daily loss is around 0.7 ppm FC but this drops to less than 1 ppm per week when the temp drops to 50ºF. Based on the...

Welcome to TFP! :wave: Sorry you have to leave your pool and that (apparently) there isn't one where you are going. If no one buys it you can always leave it for the new owner as part of the sale along with a reference to this site. :D

Welcome to TFP! :wave: Rain usually causes the pH to rise from the aeration caused by the drops hitting the water, but if the rain is acidic and there is a LOT of it then the pH can be seen to drop. As you have surmised, it's not the main thing to be concerned about. Water parameters will...

Algae doubles in population every 3-8 hours so it won't turn that fast in just one day. It was probably in a dull/cloudy phase before it turned and the mud just used up the chlorine quickly.

The higher concentration bleach (10-15%) is usually called chlorinating liquid or liquid chlorinating compound to distinguish it from liquefied chlorine.

Just saw this photo gallery article on Yahoo! Homes where the #6 turnoff for home buyers is an above-ground pool and the #7 turnoff is an in-ground pool. They caveat that in-ground may be OK in areas where such pools are common such as in hot climates, but this article says that one of the main...

My wife uses suntan lotion when she swims nearly every day so there's a lot of lotion that gets into our pool. It mostly leaves a thin film you can see when she's in the water, but it is mostly gone sometime before the pool is used again the next day. I don't notice it forming slime along the...

In this case I think it was an accident since she was just cutting a corner too close around the pool where she stepped onto the somewhat wet tile that is roughly at pool level and is the "ledge" that the pool cover goes over to get rolled into the submerged pool cover vault. She slipped and...

Our first cat fell into the pool but it was near the end of her life (she was 18-1/2 years old at the time) and though I got her out right away I think she had a stroke since she became temporarily blind over the next day or two and she died a couple of weeks later. She was definitely in the...

Yeah, the scare tactic of being a toxic poison that can kill was really inappropriate. For most disinfection by-products, including cyanogen chloride, the issue is not one of acute immediate toxicity but rather of long-term cancer risk. However, for cyanogen chloride, it has not been tested...

Above-ground pools usually do not have main drains. Having one skimmer is not unusual (I only have one for my 16'x32' in-ground pool) and there may be multiple inlets. It has realistic features including a Trichlor puck floating dispenser and a pool cover that is offset on its reel to easily...

Congratulations!

If you need the high color rendering index (CRI) of an incandescent-style lamp, halogen bulbs are still available and the newer ones have infrared coatings on the bulb that make them about 30% more efficient than equivalent incandescents so they exceed the 27% minimum improvement required by the...

Most of the winter except for possibly one month, such as January. Basically until it gets so cold and rainy that it is unbearable for my wife to go out and do her therapy exercises and swimming. Nevertheless, as bad as that is, she would rather do that then use the indoor community center...

Our pool is open, but only because we are now using gas. With solar alone it would be in the high 70's water temp at best.

A BTU is the amount of heat needed to raise one pound of water one degree Fahrenheit. 4800 gallons of water is about 40,000 pounds to that would be 1.5*40,000 = 60,000 BTU/hr. That is net of the heat loss from evaporation and conduction. The worst-case evaporation assuming 0% humidity and 8...

That's true for a bubble-type cover that is well insulating, but for an automatic pool cover it's thin vinyl and only about half as insulating as a bubble-type cover. I have such an opaque electric safety cover and while it eliminates the losses from evaporation, I still get losses from...

Is the auto cover semi-transparent or do you open it during the day and close it at night? Or is it a black opaque cover? I'm wondering how you are getting the temperature up in the pool.