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If that is the case, then that ends my investigation. I'm not sure it ever worked, so that would be par for the course. I guess its time to start researching robotics. Thanks for your help mas985!

Yes, you are right. I could try attaching the cleaner with just 1 section of hose and calibrate that. Though I don't know how much head the cleaner will add. At this point, I just want to know for sure that my pump is in the ball park of its specs and not with a damaged O-ring as jimingreen...

That is interesting, jimingreen, I'm fairly handy. Is it something that is DIY? What pump do you have? I saw that a gasket kit is available for my pump fairly inexpensively. Will order that and keep testing till it shows up. Thanks!

Wow! Hi Mas985, thanks for helping out. Awesome work you do here. Calibration was done at full speed WITHOUT cleaner attached. All the flow is going to skimmer. I have a simple set-up. Old pool. The main drain plumbs to the single skimmer (I have that closed off), and the skimmer goes straight...

Thanks kadavis, I have the cleaner plugged into the skimmer. I use a poolskim on one of the returns to do the skimming. I am trying to get this to work on the low speed. If it won't work then I will give up and go robotic. Where I am stuck is that by all my calculations (attached) and by my...

I'm going to try it tomorrow, might have to get some easy to switch of return fixture. I'm not sure it will work because as I was thinking about it, if we consider the limiting case of closing all the returns there will be no flow. But this stuff is counter-intuitive sometimes, it might depend...

Hmmm, I didnt think of that dpost94. My impression was that blocking a return at its exit would not help because the pump would still be pushing water right up to there. But maybe, thats not true because it is "dynamic head". Let me try that tomorrow. Though, I am loathe to switch of any returns...

Ha ha! Thanks Jim! Ugh, so you are saying it just might not have enough juice to run at low speed, thats a bummer. Nothing I can adjust? I can't switch off any of the returns as they are all grouped. I have a good 70 ft of 1.5 inch pipe on the return side. The two speed pump runs at 1725 rpm...

Thanks dpost94 and Texas. The cleaner hose is brand new, I've held sections of it out of the water and not heard any hissing. I'll blow out all the air and check it again this evening, bicycle tire style. Just to double check. I think its unlikely that chemistry is a problem. The pool water has...

Sorry DPost94, I should have mentioned that. I thought my signature would show but it doesn't seem to be showing. Its a Hayward Sand Filter. Sand is about 2 years old, backwashing is done every two weeks. O ring was also changed this past week and lubed. The sand filter seems to be doing its...

First post on this awesome forum, I've poked around, lurked around a bit, superb stuff here, thanks to all! My problem is that my suction is too weak to properly run my new 4 wheel PoolCleaner on the low speed of my 2 year old two speed pump. And I cannot understand why. By my approximate...