I bought this one at Home Depot on the recommendation of a couple of MOC members. It's a Whirlpool, model WHCF-DWHV, and cost around $30 to $40. I had to buy, while at HD, an adapter for the inlet and the outlet to adapt to a hose connection. That's in the plumbing section. The filter is supposed to handle a whole stick home for six months. We'll see about that. I bought a 2-pack (or is it 3?) of spare filters for something like $14. The flow rate is 6 gallons per minute, so it does not restrict the water flow. That's important to us. I just lay the thing on the ground near the park's water connection. It has a switch on the head for Filter, Bypass, and Off. The manual doesn't state the physical size but I can easily transport it under one arm. OK, hold on and I'll do a quick measurement. Total length is 13 3/4 inches. Widest point is where the hoses connect. That's 5 inches in diameter, excluding the hose adapters. Those add maybe an inch or inch and a half.
This link might be more informative. It's the second one on the page.
http://www.whirlpool.com/catalog/cat...categoryId=174
Threaded Mode
