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Low pressure of 5 on our pool pump. Replaced sand, replaced filter O ring, no air leaks (no bubbles, no air in pump), and no clog in the filter line (bought a device to clear out any potential clogs, and all is good). The pool company said our motor was fine, impeller included. The new cleaner I bought won't climb the walls more than 2 feet and algae is growing on them. (This cleaner should climb the walls). Could it be a 1 HP motor is too small? Pool is about 22,000 gallons. Our old cleaner used to climb the walls a long time ago but we have a different motor since then, have no idea if the size is different. We have the ancient Hayward type motor unit and filter. Don't know where to go from here and algae treatment is expensive (refilled pool water last Oct). HELP PLEASE! :-)

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  • mywave Jul 11, 2010

    We took the motor off to see if the impeller needed to be replaced/clogged and the pool guys said it was fine. However we did not take the impeller off the motor. Would the clogged side be the grooved side? that was fine, no clogs.

  • mywave Jul 11, 2010

    Also no clog between filter and impeller

  • mywave Jul 12, 2010

    I would say I'm 90% sure there is no obstruction. We do not have any problems filtering small palm seed things that wind up in the basket. I would imagine those would get stuck in any clog. We ran the pressure attachment from the hose both directions from the skimmer and from the filter. The water went through fine and there was no 'back jerk' like the clerk had suggested if there was a clog.

    I do have a tiny bit of air in the pump I noticed, but it is a very small amount. (After running the pool several hours, it takes about a couple of seconds to release the air). What is the best way to check for air leaks? thanks!

  • mywave Jul 20, 2010

    My problem has more/less been fixed. My pressure is still low, but I was missing a plug in the skimmer line for the maindrain. Now, I do get more suction to the vacuum. thanks!

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My neighbor had this same problem. His problem turned out to be that his 2 jets on the side of the pool had.... had the eyeballs removed unscrewed & lost ( most likely by kids metalling w/ them) This caused his entire piping system to not build up the proper back pressure it needed to drive his polaris. A simple trick to try would be to turn on your pumps & put you hand over one or both jets which will cause a build up of pressure & watch your cleaner to see if it climbs the walls like it should....of course if one or both you eyeballs are missing then there you go. Fixed my neighbors. It only cost him a case of Bud for my fix but he had already rebuilt both pumps & bought 3 different polaris's before I pointed out he had no eyeballs.

Posted on Jul 20, 2010

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Sounds like your impeller is clogged, you might be able to remove the pump basket and feel inside the impeller to see it it's impacted with debris. You may have to pull apart the pump to clean it thoroughly.

Posted on Jul 11, 2010

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  • Dale Cobb Jul 11, 2010

    if the impeller is clear, the problem may be with the motor sizing. Make sure the motor is rated big enough for the impeller. You can always but a bigger size motor on a smaller impeller but you can never install a smaller motor than the impeller is rated for. you will usually overheat the motor and it will cycle on and off with the high limit. Are you certain that there is not an obstruction in the suction line?

  • Dale Cobb Jul 13, 2010

    Suction side air leaks are a little hard to find. Check all of the most suspect items such as any unions (snug and O-ring intact), fittings (cracks or discoloration), and pipes and valves for obvious cracks. If you have a jandy type valve, check all the o-rings and lube everything. Make sure the threaded fitting going into the pump is tight. They can loosen if the pump has ever run dry or the wrong sealant was used.

    Sometimes you can turn the pump off and open the air relief on the filter to backflow some water through the suction line and hopefully you will see some water spurt out. It's difficult because water may not pass through spaces will air will. The last resort will be to have the entire line pressure tested. You may need to get creative.

  • Dale Cobb Jul 22, 2010

    I'm glad you found a solution. If you have plenty of flow and the cleaner is working well. You may try a new pressure gauge to double check it's accuracy. Thank you.

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