Question about Pentair Sand Dollar 19" Filter with 1 Hp Dynamo Pump System Fil Pen 145148

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Our two-year old filter is not cleaning the water. I have run cleaner throught the system. I have now done two rounds of chemicals to help clotting in the filter. It has been two weeks and I still do not have clear water. I have spent hundreds on chlorine, etc. Thoughts?

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There can be a couple of different reasons for this issue to happen. The first thing to know is if you have had an algae issue. If you have had an algae issue, all of the chemicals will not kill the algae inside the filter itself. You will need to comletely empty the filter of sand, wet/dry vac works best, take the internal parts out of the filter and soak them in bleach water, then replace the drain plug and put bleach water in the tank. Scrub the bottom and sides of the tank, a long handled brush works well, and then drain that water out. Rinse out the tank with a hose, reassemble the parts in the tank- MAKE sure that the laterals are in tightly. IF you have laterals with "slots" on one side and solid plastic on the other, the slots MUST GO DOWNWARD, or you will be pouring sand right into the pool.

IF you have not had an algae issue, you may have "packed" sand in the filter. You will need to open the filter up and mix that sand around, being areful not to break a lateral on the bottom.

If there is sand returning to the pool, you may have a broken lateral that needs to be replaced. For an Owner's Manual on the Sand Dollar, use the following link:

http://www.pentairpool.com/pdfs/SandDollarOM.pdf

Hope this helps!

Posted on Jul 10, 2009

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Basic Swimming Pool Care


<p>Basic Pool Care Tips<br /> <ol> <li>Test chlorine and pH at least 3 times per week. Have a comprehensive water test every 6-8 weeks at your local pool store. There is generally no charge for this test.</li> <li>Operate pool equipment a minimum of 6-8 hours per day during winter months and for 10-12 hours per day during the summer for greatest overall benefit.</li> <li>Brush the pool walls and floor a minimum of once a week.</li> <li>To prevent damage to pool equipment make sure the water level never drops below the opening of the skimmer.</li> <li>Lubricate backwash valve "O" rings on sand and DE filter four times a year. Lubricate pump lid "O" ring periodically with Lube specifically designed for use with swimming pool equipment.<br /><br /><img src="water_1.jpg" /><br /><br /></li> <li>Test pH and add muriatic acid as indicated to maintain pH between 7.4 - 7.8. Never add more than 1 pint of acid at a time and wait at least 1 hour between treatments. Always add muriatic acid by dispersing into pool water opposite the skimmer and disperse as far away from the wall of the pool as you can safely reach. Use care not to drip acid or any chemicals on deck as it will cause deck etching and staining. Do not pour acid over steps, benches, or pool light. Make sure water is circulating.</li> <li>Clean waterline tile with cleaner a minimum of once a month during peak season.</li> <li>One month after initial pool start-up, add stain and scale inhibitor on a regular basis.</li> <li>Always follow manufacturers instructions on product labels.</li> <li><b>NEVER ADD WATER TO CHEMICALS</b> - Add chemicals to water.</li> <li>Always wait one (1) hour between adding different chemicals unless otherwise directed. <ul> <li><b>Filters:</b> <ul> <li><b>Sand Filters:</b> Backwash once per week</li> <li><b>DE Filters:</b> Backwash once filter pressure increases 8-10 psi above your "clean pressure" noted at start-up.</li> <li><b>Cartridge Filters:</b> Need to be taken apart and elements need to be cleaned once filter pressure increases 8-10 psi above your "clean pressure." This cleaning should be done at least a minimum of twice a year.</li></ul></li></ul></li></ol>

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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.

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