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    Mystery Pool Capacity

    You could utilize the acid demand test included with your Taylor kit, and then add acid until you achieve the desired PH in the pool. You can back calculate the capacity to within 20% or so, which is good enough. A large pH change is what’s required for this to be useful, and is probably the...
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    One pool guy told me that Black algae is almost impossible to kill. Is it true?

    It is normal for water to get behind the light. It is not normal for there to be water inside the metal light housing.
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    One pool guy told me that Black algae is almost impossible to kill. Is it true?

    After you have scraped off as much of the algae you can, a pressure washer is good for this, I have found putting a towel over the algae and saturating it with chlorine for a couple hours, seems to help. You probably could have accomplished the same with water in the pool. Acid wash and pressure...
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    Dust plumes from outlets on pump start

    I’ve had the same or similar issue. I had a small leak in the pump basket lid that was sealed when the pump was on, but allowed air to enter the system when the pump was off. The water in the filter is above the water level in the pool and the water would drain out of the filter when the pump...
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    Choosing Suction Pool Cleaner

    Wondering what happened to your kreepy? I’ve had three and they have all lasted at least seven years. Interested in what I should look out for.
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    Gas Chlorine?

    Don’t some large commercial pools operate onsite chlorine gas generators, and then inject the gas into the returns? I believe there is some energy savings utilizing this method over traditional SWG, but I’m not sure this is the reason they are utilized. This particular pool had lots of fountains...
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    Can I start adding CYA if my chlorine level is 15?

    Mine comes back in about a year too. I’m going to try using a pressure washer underwater next time. Have no idea if that will work, but it works well when the pool is empty. Good luck.
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    Help from the experts please? Black algae vs replaster?

    Pool tile is different then regular tile and usually quite a bit more expensive. I think it has something to do with how much water the tile absorbs when submersed.
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    Can I start adding CYA if my chlorine level is 15?

    I was thinking of tiling to permanently eradicate my black algae problem. Guess not. I was wondering if it came back just in the grout or on the tile too? Do you think it is a new outbreak or is it reoccurring in the same areas that it was a problem on the plaster. Tough problem.
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    Help from the experts please? Black algae vs replaster?

    You can manage it with a drain and pressure wash. I found chlorine soaked towels stuck to the walls better then an acid wash, but others have had success with an acid wash. Slams aren’t effective at all, unless you actually brush the algae aggressively and frequently. Several times a day can be...
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    Help from the experts please? Black algae vs replaster?

    I’ve had some success using a pressure washer to knock down black algae, followed by high CL levels and brushing for a few days. It has always grown back usually in the same areas, but usually it takes over a year, and if you catch it early enough, just brushing over a small outbreak is enough.
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    Liquid Chlorine

    Add acid to get your Ph down to 7.4-7.6. You will probably need to add acid frequently until yo get your TA down. Bring your FC up to 10 and see how much it drops overnight with no sun on the pool. You should switch to a 10ml sample to save reagent. 0.5 ppm will be accurate enough.
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    My CYA disappeared!

    What CYA levels are you running at? I always thought the loss should be a percentage, but I lost 30 ppm in two months starting at about 50. There was a wild fire which put lots (an inch) of ash in the pool, which possibly had something to do with it.
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    Liquid Chlorine

    I don’t think it would hurt anything to add chlorine until its 5ppm, until you can get a test kit for CYA and find out how much you actually need. Also, adjust your pH if it’s not in the 7’s.
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    CC always at or around 0.5

    0.5 is at or near zero, especially if you are using a 10cc sample. If the second drop results in no color change, the result is 0.5 CC at the most.
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    Non-Chlorine or Chlorine Shock

    If the three inch pucks you have been using are trichlor, they add CYA to your water. This can add up quickly. It does extend the half life of the chlorine from UV degradation from the sun. But it also greatly reduces the level of available chlorine for killing algae. You should check your CYA...
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    hole due to buldging at the deep end due of Fiberglass pool

    Hope the cement sets for you. If you can get some matt thru the hole to the concrete side of the hole it might help hold the fiberglass repair in place. They also have loose glass fibers that you can add to the epoxy to give it some added strength. Good luck.
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    hole due to buldging at the deep end due of Fiberglass pool

    If I was repairing a boat I would want to grind away the existing fiberglass about 3inches around the hole to provide a good strong bond. I would not just overlay a single layer of Matt, but build up several layers of Matt right through the full thickness of the hole. No cement. I would use...
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    Pump basket no water?

    Was wondering what the final solution was to this problem?
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    Pool Chemistry Review

    You need to estimate the average depth of the pool. 5 feet deep is frequently within 20% of the actual average depth. With those numbers it’s 30,000 gallons. Just add chemicals at less then the estimated dose, and then test to see if you need to add more until you’re fairly confident in your...
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    PPM FC Drop Related to FC/CYA ?

    Your losing less than 33% of your FC. Have you run it at a higher FC level to know more accurately what percentage you’re losing? I’m trying to understand if there is some unexplained shielding effect of high CYA values not explained by the half life chart.
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    How much liquid chlorine will I be using weekly (what is your guess based off experience)?

    A guess would be 4 plus or minus a couple depending on a whole lot stuff.
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    Ran Across this about Crypto parasite - fyi

    CDC recommendation is to not enter a pool for two weeks after having diarrhea. Not many people follow that recommendation. Tough stuff to kill. They say 20 ppm for over 12 hours at 0 CYA. That would be about 1000 ppm at our typical CYA levels. Interestingly there are apparently test strips for...
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    Pump basket no water?

    Until you figure this out I would bleed the air in the filter whenever you can. This will make your pump and filter happier. With regard to your skimmer, that design replaces a weir with the top part floating up to the top of the water just like a weir door. The idea is to increase the velocity...
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    Pump basket no water?

    The MVP is on the return side of the pump so it can’t be a “suction” side leak. It can cause the pump basket to empty by letting air in and allowing water to drain back into the pool. This will cause the pump to have to prime and will result in some air in the pump basket as the air in the...
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    Pump basket no water?

    You shouldn’t have water in the middle of your multiport, and although only a little water comes out, enough air can go in to drain your pump when there is no pump pressure. The spider gasket can also cause air leaks that are hard to diagnose without taking the multiport valve apart and looking...
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    Typical Chlorine depletion

    My CYA is 40 and I’m losing 5.5 ppm per day. Roughly 8 to 2.5 ppm. I’m in the tropics (Hawaii) with the sun directly overhead and the UV index 11-14 every day. I lose 2.5-3 ppm between the hours of 10:30 and 2:30 pm. I was pretty surprised when I started keeping track. In the winter the usage is...
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    I live in Kihei, so a similar climate and am going thru 5-5.5 ppm of chlorine a day with a CYA of 40. I was wondering what your usage is like?
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    High Phosphate Levels

    You’re right on target FC with a SWG. With a 50 CYA your minimum would be about 2.5 FC. I believe the lanthanum is suppose to bond with the phosphate into an insoluble compound which can then be filtered out, so lanthanum would be in your water at a much reduced concentration after it has done...
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    Stumped with Massive Chlorine Loss

    I’m very interested in your usage after you bump up your cya. I live in Hawaii, and we recently had a UV index of 13, cloudless day with the sun directly overhead at my latitude. Chlorine went from 8 to 3.5, with no overnight loss and CYA at 50. My biggest percentage loss I’ve ever noticed...