Which pump do I need for 33' above ground?

[PoolDoc]

In layman's terms, AG pool makers have been more-or-less lying about the capability of AG pool equipment, probably in order to 'sell sexy'.

They've developed, and gotten 'approved', bogus AG pump descriptions and HP ratings, and have gotten 'approval' for severely over-rating filters. I'm not sure why, but it may be so they can match them with over-sized pumps.

Horsepower, in US marketing, has "sex appeal". Filter square footage figures, which are complicated, don't. So pool salesmen market BIG pumps, to make the sale, but cut corners with little filters because pool buyers don't know the difference.

Bottom line: ACTUAL effective filter rates are the COMMERCIAL rates; residential rates -- even when "NSF Approved" -- are essentially bogus. Those rates (the real ones) are:

+ sand filters => 15 gpm/sft
+ DE filters => 2 gpm/sft
+ cartridge filters => .4 gpm/sft (0.375)

Your 175sft cartridge may have a bogus above-ground rate of 120 gpm, but the real rate is about 60 gpm. (My bad; I had a typo above!)

However, cartridge filters suffer from excessive flow more than sand or DE filters do.

With sand filters, if the pump's too big, you just blow the dirt through the sand, but don't usually damage the filter itself. With DE filters, the filter just stops up faster. With high head inground pumps, you can build up enough pressure to damage a DE filter, but probably not with AG pumps.

But, with sand filters, if you try to push too much flow into the filter, you collapse the pleats against each other. I'll try to post some pictures and other info, later

[kenspam]

Thanks for the explanation, no wonder I was so confused!

[PoolDoc]

Yeah, like many other industries, the pool business prefers a sexy and complex sales pitch (= fancy-shmancy lie) to plain statistics and honest explanations. Even if a company prefers to be honesty, it's hard for them to do so, since an honest description makes their product sound boring and out-of-date compared to junk being marketed with the latest 'sexy' lies.

The medical industry does exactly the same thing, when you get prescribed the latest patented drug @ $400/mo even when research shows the $10/mo generic is more effective. Only the scale is different: the pool biz rips people off for millions; the medical trade rips people off for trillions.

I have a friend who is an orthopedic surgeon of some skill. He's pointed out to me that you can tell doctors who always cut, even when therapy works as well or better, from doctors who recommend therapy first, and surgery if therapy fails . . . by which cars they drive. The 'top' orthopedic outfit in town reportedly won't schedule a 2nd appointment, without a commitment to surgery. Unsurprisingly that team's doctors tend toward Mercedes 500 models and the like.

In both industries there's a sort of Sgt Schulz ("I know NUTTING, I see NUTTING, I'm just doing my job!") collaboration between doctors, lawyers, gov't regulators, hospitals and drug suppliers on the one hand, and manufacturers, wholesalers, pool stores, builders, and the NSF on the other hand, that rips off victims without affording them a single clear 'bad guy' who's doing it to them.

PS: for everyone who has no idea who Sgt Schulz is, because they are under 50, and thus never saw Hogan's Heroes . . . Youtube to the rescue: http://www.youtube.com/watch?v=kp9BJxFHDYI

[kenspam]

I have learned that the local pool store uses scare tactics like how much it'll cost me in the long run if I don't buy their salt for instance. I knew if I called them for advise, I'd only get a sales pitch so I got online instead. As for the pump, without much time to research I snatched up a Hayward Power-Flo LX 1 HP on craigslist for $80 new in the box - story was their pool was destroyed by tornado and they had already purchased pump but never got to use it. The price helped me decide, although I had to drive a few miles pretty close to you by the way - Dalton, Ga. I hope it's compatible as I really like my cartridge filter.

[PoolDoc]

Should be fine.