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How is your pool water circulation? A deficient circulation will result in recurent algae boom as part of the water may be low in chlorine. Is your return jet directed down? If not you may have a seperation layer (cold water on the bottom and warm water on top) and the cold lower part of the...

Keep the filter clean and the pump running 24/7 until the end of the SLAM. Any dirt in the filter will also increase the chlorine demand.

Bromine is sensitive to UVB. Covering the pool with a solar blanket will reduce the amount of UVB and the sanitizer bromine level will be more stable. If you want to convert from bromine to chlorine you must replace the water. If the pool is warmer than the city water, than you can create a...

Looking at your picture of the pool made me think that you have a problem with the water circulation. It is possible that you have low chlorine concentration on the lower part of the pool if water is not well mixed up. I see that you have a robot. Put it to work. It will mix the water layers and...

First of all I want to express my gratitude towards many experts and experienced persons for the time spent for answering our questions. I do have a question regarding the metal stains in pools or spas that are sanitized with bromine. Since bromine is a less powerful oxidizer is it less likely...

I would increase the CYA 10-20ppm and see if that improves the situation.

Do not waste your time with the ORP sensor. Readings are influenced by many factors. Ph has a big impact on the sensor output and is difficult to have a control loop with both PH and ORP sensor. You may have separate loops, but they should not interfere with each other. CYA can be added to the...

DMH???

I have a dome like this one: http://www.piscines-online.com/abri-de-piscine-signature.html Is on rails and very easy to use. Keeps the water warm and protects the chlorine (in may case bromine) in the pool from sunlight UV. At one moment it had 40cm of snow on it with no problem. Great in...

I have stumbled on this site: http://www.google.com/patents/US5948315. Any comments?

Just keep the pH in the range. Sanitize the pool when in use. There is no reason to keep the swimming pool water sterile when nobody is using the pool. It may reduce the chlorine usage as algae growth will be inhibited at all times. I use a similar product together with a UV lamp as the pool is...

I use bromine since I cannot use a salt system. It is a little more complicated but not significantly more expensive here in Europe. It does not have the chlorine smell, it has a different smell. The eyes are affected by a pH out of range. I use an automatic pH controller and keep the pH at 7.4...

I think you have to deep wash your filter. If the sand in your filter has channels, than the DE will end up in the pool. The pressure should not be zero even at low speed. If the pressure dropped after adding the DE is possible that you have another obstruction before pump (pump filter?).

Against the common opinion of most of the people here I would recommend to you the installation of a UV bactericidal lamp in series with the pool filter. This cannot be considered a viable sanitation system since it cannot sterilize anything that do not pass through the lamp, but is a great...

At this stage I would be more concerned with the design of the water circulation in the pool. A bad design will leave some water unmoved and still water must be eliminated. A bed design is difficult to correct later on and the water sanitation will not be good whatever disinfectant you use. This...

Good point.

Can we have a section for swimming pool jokes? I would love to contribute even though I am not a native speaker.

I would recommend sodium bromide only if the CYA level is high (~100 or more). Bromine is also less volatile and therefore more stable at higher temperatures, but this is not the case. If the main drain cannot be reconnected (for whatever reason) one should keep the level of the sanitizing agent...

Stagnant water = trouble. Algae and bacteria will find refuge in those places where there is little water flow as the disinfection agents: chlorine or bromine will not be present in those places. The rest of the pool may be nice and clean, but pipes and other places without water flow will offer...

It seems to me that you might have a circulation problem if the algae starts to grow in the same spot. If the deep end drain is not in circulation than you might have a temperature gradient from the surface to the depth. The cold water is heavier and will not mix with the water on the surface...

http://www.andrewboyd.co.nz/waterpark.jpg

As long as you are fighting algae the recomandation is to run the filtration system 24/7.

At higher the water temperatures you need longer pumping time. The algae doubling time is dependent of temperature. At lower temperatures you need to run the pump less, at higher temperature is opposite. At higher temperatures chlorine will outgas faster as well, so you may need to add chlorine...

I guess it is a question of inertia and a question of preference. People are hesitant to change old habits. Then, some prefer to have a daily routine of adding bleach, measure and so on, while others would like a system that work on its own, and does need intervention only from time to time. I...

If you have a significant temperature difference between surface and deep end when the filtration system is working, then you have may have a stratification problem. Cold water sits on the bottom of the pool while the warmer water is closer to the surface and gets circulated and chlorinated. If...

I would use 4-6 ppm bromine from sodium bromide without hesitation. It is not affected by high CYA levels and will be diluted together with CYA when and if decide to drain and refill. Some chlorine will be used to convert bromide to bromine, but if you add enough chlorine you will have a...

All organic debris will use up chlorine, not only algae. Water has to be as clean as possible. Better buildup of leaves on the cover than in you pool. You have to clean the filter as well. Lookup the deep wash procedure. Keeping everything clean you maximize your chances of success. Do you have...

Use an opaque cover. It will starve the algae of light and protect chlorine, so you have a win-win situation. If you do not have one, get one. It is a wise investment since the SWG will have to work less, therefore it will last longer. How is your circulation? Do you have the pump on 24/7? Local...

Most likely some oil will surface. If you clean the oil, I see no reason to rebuild unless you have obvious structural damage. The isopropanol is not a problem since will evaporate in few days. Ethylenglycol is sealed and the aircon fluid is sealed as well. A car is a dirt pit and I think is...

Copper sulfate can be also used. There is no evidence that copper ions from an ionizing cell are different from copper ions from copper sulfate. Copper concentration has to be at 0.5ppm in the pool water and has to be measured. Any lower, and copper will not inhibit algae growth while at higher...