Question about Hayward SAND FILTER, PRO SERIES

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Pool had a lot of brown silt algae,cloudy put in correct amount of chemicals,back washed several times.pressure at 17 lbs goes to 21 in 1 hour.Tried to drain filter and I cant get the water to come out.I was going to put a cleaner in it.

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First I'm assuming we're talking about a sand filter. Back washing is the right thing if pressure increases.A 8-10psi pressure increase is the magic number where you must backwash. Be sure to run a rinse cycle too before returning to filter. If you want to clean filter you can buy chemicals that you add to your skimmer as you backwash. Follow their directions. If you do want to drain the water, open your basket cover on the pump and remove plug, this will allow air to enter the filter, so it will drain. It drains slowly. Not really necessary, except to winterize.l

Posted on Aug 03, 2010

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3 Answers

Algae dust in pool


I think Brandon's answer deserves a little more time and a slight explanation... as I think it is Spot On!
Algae dust is usually "Already DEAD" algae!
And normally it is way to Small & Fine to be trapped by the filter.
We here on this forum do not know what type of filter you have, But if you do have a "MultiPort" valve as Brandon suggested you turn to the "Waste" mode, you will not use the filter mode to vacuum, as this will only BLOW the Fine Silt like substance right back into your pool, spreading out into the water to be suspended turning your water cloudy if not green, until it settles, and once again you have a covering of Dead Algae Dust on the floor of your pool. But when the filter valve is in Waste mode, you will bypass the filter and the return line altogether and your vacuumed algae silt will be sucked up into the valve, and OUT the valve to waste. And just like that all of the algae dust is vacuumed out and did not Blow back into your pool.
I just had a situation where we cleaned up such a pool where the customer couldn't get the algae out, we came out and vacuumed to waste. And I by chance took a picture of the partially vacuumed pool and Dust remaining.

algae-dust-in-pool-iwrnrkacomuoeuyhvucmvd0t-2-0.jpg If you don't have a multipart valve, then if the pool has no debris but only dust, then and ONLY then, should you use Backwash mode. You NEVER want to vacuum a pool with debris in Backwash mode! NEVER!!! Because the larger debris you are vacuuming will get caught in the internals of your lateral drain assembly or your DE Grids. then it will be very difficult to un clog them, which in turn will reduce proper water filtration efficiency! But the algae dust will be able to pass right on thru. If you have neither of these types of filters because you have a Cartridge style filer, the elements may be able to trap the dust, if it is still to fine to filter, you obtain an additional pool pump, place it pool side, and in the pump out the pump will be two vacuum hoses and away you go.

Good Luck

Aug 01, 2013 | Pool & Spa

1 Answer

Algae removal from Intex Ultraframe pool with salt water/sand pump


Its a very tough strain of black alhae. Shocking the pool with liguid chlorine will do the trick. First lower the ph level by adding muriatic acid(either pool store or local hardware store carries it). This lowers the ph level quickly. Pour it around the edge of the pool. Wait an hour than add the liquid chlorine. Let circulate for 24 hrs than vacuum to waste. The chlorine is more potent when the ph level is lower, thus the use of the acid

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1 Answer

Is my pool pump filtering correctly?


The cloudiness or turbidity of your water indicates a leaking or damaged filter membrane/element. The green color is due to the growth of algae. Are you using the right algaecide? Is the dose right? You have to consult a water treatment specialist to know these.

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How to I bring up my chlorine levels with my salt water generator? All other levels are in range. I have added the recommended amount of salt (310 lbs) for my pool size (5000 gallons). My pool was green...


You can cloud your water by adding chemicals that are incompatible. You will cloud the water if you simultaneously add a water clarifier and a chemical to inhibit the buildup of lime scale. You will cloud it if you simultaneously add chlorine and scale inhibitor. You will also cloud your water if you simultaneously add soda ash and a chemical to increase the hardness of the waterResources recommends sodium hypo, lithium hypo, dichlor or calcium hypo to superchlorinate water until it contains 10 parts per million (PPM) of free chlorine.



Jun 17, 2011 | Intex Automatic Salt Water System for ...

1 Answer

We changed our pool over to salt water four days ago ago and it is cloudy and has green algae in it. It had green algae when we switched. We thought the salt water system would kill it, but it is still...


You don't mention the size of the pool. If this is a above ground small pool ... dump the water, clean the liner and refill it. Remove the metal with a sequestering agent. Get the alkalinity correct. Get the pH correct then add the salt to 3200 ppm.

Chlorine kills algae. Are you sure it is algae and not metal in the water?

pH should be 7.2 to 7.6. Alkalinity should be 100. If a gunnite pool, the calcium should be 300. Salt should be 3200. Cyanuratic acid should be 50+ if this pool is outside (not indoors).

What to do. If this is a big pool, and you are sure this is not metal in the water, I would super chlorinate the pool - take it to 20 or so ppm. Run the filter for at least 24 hours. Watch the pressure ... you will be filtering out a lot of stuff.

Let me know what happens ...

Thanks for your question @ FixYa.com

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We put a salt system in in March of 2010, and starting in August, have had problems with black residue forming on the sides of the pool and bottom. The light is crusted with a blue green substance that...


Well what your describing should have nothing to do with whether it's salt or not. What your describing is a bad algae problem. Only so much can be done without actually seeing the pool. Depending on how well you are maintaining your chemicals, and what chemicals you are putting in the pool lots of things can happen. The blue green that wipes right off sounds like algae. The black can also be algae, or if the PH has been too low in the past, then metals can dissolve into the water, and when PH goes high, then metals come out of solution and leave black or brown staining. High calcium also leaves white, tan or brown staining depending on the chemistry of the water. removing stains from vinyl pools can be difficult to impossible depending on the situation. If your maintenance guy can't answer these questions I'd seriously consider changing companies, or getting a second opinion at least.

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1 Answer

Cloudy and green water already put algae in pool


you may need to re-fill the pool now? the filter has not done its job fully and you havent tested the water,,for PH? or you would have spoted this comeing,,,the pool will need extensive filtering and cleaning now plus lots of chemicals put in it before you can use it

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2 Answers

CLOUDY WATER


I too have this problem after treatment for algae, especially if I got a day or two without running the pump, it starts to get mildly green. After adding the algaecide, it kills the algae, but leaves what I call the white dead floating...it takes several days for this to phase out.

If you aren't already doing so, put 3" tablets in the pump basket housing, that helps dramatically. Put a pair of knee-high pantyhose (one inside the other), on the return inside the pool. (you will be amazed what it catches after a few days). Also you can try some "clarifier" to help clear up the cloudiness.

I'm no pool expert, but have dealt with the cloudiness myself. Through trial and error, have learned that cloudy water doesn't necessary mean dirty water. It will clear within a day or two if you are keeping stabilizer tablets in pump basket and using shock once a week. And run the pump for about 8-12 hours a day, it will clear up quicker. And to me, using the pantyhose is an extra-filter and it catches the 'gunk' that the sand in the filter isn't catching. (it can't possibly get everything). Be sure to backwash your pump frequently too.

Hope this helps at least some. Good luck!

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1 Answer

Sta-Rite S7M120


The brown-green gunk sounds like algae. You stated that you have cleaned the filter. Have you taken the cartridge completely out? If not, I would suggest that you do so. Scrub the inside of the filter tank with a 4:1 bleach water mixture, only 1 part bleach. Then soak the cartridge in an acid bath, like Muriatic Acid. This will kill any algae that is in the filter itself.

You may need to vaccuum your pool to waste, get rid of some of the water and refill it. This may help get the chemicals in order.

Another idea would be to run the system continuously for a couple of days. Vaccuum to waste, not to return lines, and clean the filter when it reaches 8 to 10 PSI above start-up. You may not be running the pump long enough to properly filter water. Keep trying to get chemicals in order.

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Although the chips inside the pump could decrease the efficiency i doubt that this is why you were unable to get the pool clear. What type of filter do you have, how old is the media inside it, and was the water just cloudy, or did you have algae problems?

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