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I have a Pentair Dynamo 2 speed (110 volt) motor (pump) that is not working. It hums at both speed settings but does not spin. I've read a number of the posts about this, tried various suggestions, and still cannot get it to work. The "humming" problem came about after a refurbishment of the...

Where I live (Nicaragua) the "best" test kit available is the Pentair PRO-11. I have not been able to contact Pentair about using the kit since they ask to leave a phone number to return the call which will not happen since I am using Skype. A couple of emails also remain unanswered. I am...

Looks like I'm going to have to replace my Dynamo 1HP, 2 speed pump. Everything electrical is good but the motor housing, end plates and base plate are badly corroded to the point of splitting apart. The pump was run on low speed (about 3 amps) 95% of the time and had a minimal impact on our...

Hopefully I can get some thoughts about slamming a budding mustard algae bloom in my pool. The hurdle is that I live in Nicaragua and there is no way I can do (or buy) a FAS-DPD test. The best I have is Pentair's Pro 11 test kit. It uses tablets to test for free chlorine (DPD1) and, using that...

This is my first pool (a DIYer) and I'll be building it using an "unusual" type of wall construction that would allow me to use an stock AGP liner. This is because I have to work with a rather limited selection of materials available for pool construction in the country in which I live...

I'm working on a first time build of a concrete (actually ferrocement) shell pool with a vinyl liner. I'm having a bit of difficulty finding a wall return fitting for this type of construction. It's probably only difficult because the product descriptions, photos/diagrams and installation...

Hi all, After a somewhat (very?) confusing series of chats with Pentair I would appreciate your thoughts, advice and comments regarding the selection of a pool pump based on the attached diagram and the following specs. Pool Specs: -basically two AGPs: one oval (the "shallow end") "joined"...

Is there a difference between the PVC membrane used for roofing and the PVC membrane used for site-installed liners in swimming pools? At a superficial level both are 60 mil (1.5mm) thick (other thicknesses available), have a polyester (or fiberglass) scrim/mesh sandwiched into it, and are...

I'd appreciate your thoughts and comments on the circulation diagrams in the attached file. I drew them purely on intuition and would like to know if they are "correct" or if I've really bungled them. Since this is not your normal pool, some background info: 1.The pool will have a perimeter...

I've been looking at pumps for our DIY build. An energy efficient pump is especially important since we have a battery backup system (power cuts up to 3-4 days) and will be installing a larger, totally off-grid system in the near future. (Unreliable power at $0.25/KwH the main reason). Without...

I need some help with a calculation (and "informed guesses" based on experience also welcome), that I believe is essential for specing a pump (or pumps) for my pool. So far everything I've been able to find is very anecdotal and I would appreciate a better understanding of the "background...

NOTE: It's been three years since my original postings outlining our plans for a swimming pool. The pool is finished and since we now have an internet link at home I can upload photos and captions of the build. Posts 1 through 19 are from three years ago that set the ball rolling. The build...

Hi all. Came across TFP a while back when I started to think about a pool. The site has been a great help in getting started. Thanks to all contributors. My wife and I retired to Nicaragua's south Pacific coast about 10 years ago. As great as the beach is a fresh water pool only a few steps...