I love this!! I have well water and live in the south, so that means iron in the ground... lots of it. The soil is orange and well water, untreated is orange too... I've filled my hot tub twice and on both occasions used my 'connections' at the local fire department to truck out city water (thinking it was cleaner). Well, the first time this worked well, but the hassle of coordinating time and getting the truck here wasn't ideal. The second time, I forgot to 'flush' the fire engine storage tank and got dirty water (pain the neck to clean, took a week)...

I decided to give this product a try... I hooked it to my garden hose and after flushing the unit a bit (highly suggest you do so as there will be discolored water from the carbon within) water began to flow crystal clear!!! I was totally surprised and I really didn't expect it to work so well...

The device seems to be nearly identical (only bigger) to the water filtration systems hikers use to get potable water from nasty, stagnant lakes and ponds...

My only criticism, is on my unit, despite the rubber seal being 'in place' it still leaked a bit of water out the side with the hose connection... not a big deal in my use, but if this was being used indoors for some purpose, that could leave a mess...

Perfect for filling the hot tub. Will also work for water storage prefiltering when filling the storage tank.

I have well water and if you leave the water out in the sun for a few hours, it turns yellow. I bought this filter in an attempt to eliminate this problem. When I filled the spa, I had access to a mixed bed de-ionizer tank, so I ran the water through the DI tank and then through the filter at a fairly slow rate. (Took 6 hours to fill the spa of about 500 gallons.)
The water was crystal clear and remained that way, however the hose fitting to the filter leaked through the entire fill process. I later determined that the threads for the hose fitting are actually pipe thread. I bought an adapter at the hardware store and that fixed the leak. (The filter and the advertisement claim this is hose thread.) I'm sure most people won't have access to a DI tank, and the DI tank alone should have removed most of the iron, but I have replaced about 1/4 of the water in the spa just through the filter with no signs of yellowing.
The filter also says it removes the sulfur smell and taste (hydrogen sulfide). It may reduce it some, but the taste was still strong enough that someone not used to drinking well water would not want to drink it.
I don't expect miracles from a $30 filter, and it seems to be serving the purpose that I bought it for, but I felt I had to drop a star because the incorrect threads. I don't know how many of these filters have this problem, but I did notice several complaint about leaking threads. If the user doesn't have something to stop the leak with, they either have to let the leak run onto the ground, or let it leak into whatever they are filling. If it's the latter, that might explain some of the complaints about the filter not removing the iron.

I am on a well, and we have a spa, and three fish tanks, well, with the tanks and the spa the ph was always high, I really wanted something to help remove the alkalinity in the water to help with ph, with this product, even running the water super slow, does not remove the alkalinity at all, I finally got a reverse osmosis system for the tanks and spa, it is slower, but removes 99% of alkaline according to the readings in the testers

I used this to refill my spa with our well water. Using a Taylor test kit, my calcium hardness lowered from 395 to 220.