13,000 gallon play pool with PebbleTec, featuring Pentair Triton II sand filter & Pentair Intelliflo VS pump 
We made the mistake of going with a newer pool company who was giving us a better deal than Leslie's for a filter/pump combo. They gave us a 3 year warranty, but we can't seem to get them to do anything but blame us for 2 years of pool problems. We call Pentair, who only warranties their equipment for 1 year so we're forced to go through our crappy pool company for the other 2 years. From today, we should have 1 more year of warranty and I'm worried we'll get the run around and end up being out of warranty with nothing ever getting fixed.
We suffer from constantly cloudy water that's sometimes greenish, despite being on Leslie's Algae Free Guarantee. Our regular bi-weekly water tests at Leslie's show usually perfect chemistry. We're in a Leslie's store 2-3 times a week working with the manager directly, and he's comped us many of the chemicals because he knows we're doing everything right and it's not our fault (he's awesome like that). We're going through chlorine at a hurried rate, and we've gone through bottles of algacide and clarifier, in addition to weekly treatments of Phos Free per Leslie's recommendation. But yet, nearly every time we turn on the filter, we get a whoosh of cloudy water, sometimes white sometimes brown-ish green, coming out of our pool jets that keeps our pool in a constant cycle of ick.
We had a Pentair tech out this past April after nagging our pool company to finally do something. The tech came out, looked into our water, never looked at the pump/filter, and said "change the sand." This is not even 2 year old sand, mind you. But we knew if we didn't do it, our pool company would say "well you didn't do what you were supposed to." We changed our old sand (which was pristine white still) and put in Zeolite per Leslie's recommendation. This didn't resolve the problem at all. We bought a brand new pool vacuum, a Zodiac, no difference. We replaced o-rings and the push-pull valve for backwash, and even replaced the backwash line... no improvement. We've checked for wet spots in the yard along the plumbing and found nothing. The pool company tells us we must not be backwashing enough, despite us at one point we were backwashing several times a WEEK. Leslie's has had us scale back to build up pressure, but nothing is working. We really feel this filter needs to be opened up and inspected, but we can't seem to convince the pool company to do so (probably because it's expensive).
So it's now July, and we still can't go swimming unless we don't mind swimming in what looks like a pond. We went on vacation for 6 days recently, setting the pump to go off daily per Leslie's recommendations. The day we left, there was a power outage and it reset so it never ran while we were gone. We came home to a beautiful, sparkling pool we could see the bottom in! I backwashed before running the filter to make sure it washed out good so nothing would blow back into the pool, but when I ran it for the pool the same thing as before happened - whoosh of cloudy whitish-green water out of the jets, turning the whole pool cloudy and slightly green again
Suggestions? Thoughts? We're at our wit's end!!!