Here's the one I ordered: http://www.amazon.com/gp/product/B00...ls_o00_s00_i00 As far as I can tell, the T would be for Timer, yes. The EG seems to mean Electronic timer, with GFCI.

It came with new bulkhead fittings, valves and hoses, and suction/return screens. Good deal for the money!

All that is required for you to use the larger fittings is remove the smaller ones that the 637R needs, and CAREFULLY cut the hole larger to fit the new fittings.

We did ours without a partial drain, by using a large plastic bowl held to the side of the pool while removing the old. Then covered the hole from the outside after enlargement long enough to get the inside portion of the new fitting to the hole. Then the bowl back over the hole, and tighten the ring nut to the fitting, with the valve in place on it. Didn't lose more than a few gallons of water this way.

Yes, I'll be buying the Unicel carts next payday. These Intex branded ones, you can almost see through the filter material, it's that thin. Lets a lot of fine material blow through.

One of the things I really like about the 633 is it's a pressure feed to the filter, instead of a suction through the filter. If I can find a good spot on my filter canister, I'd like to add a pressure gauge, maybe two. One before the filter, and one after. Call it a differential gauge set-up. There actually are gauges made for this purpose, but would require a bit of small tube plumbing, and those gauges get rather expensive.

Agreed on the algae thing. After only one day with the new pump, the much superior water flow had helped kill the algae I do have. Swept the pool several times today, and each time less of the brown crud settled back out. With the smaller pump, it seemed like the brown crud increased.

I don't think you will regret buying the larger unit.