CULLIGAN US-2 2Stage Drink WTR System, 13.58 x 10.23 x 4.52, White

Disclosure: Bought from Amazon in Used - Very Good Condition for less than 20% of the current new price. I'm that guy that buys the cheap stuff, then leaves reviews. This one still had water in both the filters and the housing.Culligan yet releases another proprietary system. This one looks suspiciously like their EZ twist system - Ez1,3, and 4 compatible - but it's not. The two flow holes are the same, but the 3rd keying plastic piece is not the same. It is this "key" that prevents Brita, Dupont, Culligan, and AO Smith carts from interchanging into each others systems. 3rd party manufacturers of replacement carts (Waterdrop and Aquacrest are two brands that do this on Amazon) omit the 3rd key tab and only include the water flow holes and thus can fit into any of these brands. If the 3rd key wasn't there, any of these filters would fit and work in the other brands. The problem with the specific carts for this model are that they aren't very popular. Even though they seem to be EZ1 and EZ3 respective carts from the same brand, they won't fit in (unless that key tab isn't there). Of course, the non-OEM 3rd party brands work and I have been using these carts in a similar system with no probs so far.The unit is fine on it's own and as long as carts are available, it's a good system. It uses the 1/4" pressure inserts - which is very popular in undersink water filters. But this 1/4" system is touchy and has to be used correctly - or it will spring leaks. This is true for all systems that use this type of plumbing. I've set up many systems with these mounts, and when they work, they are great. But when they fail, it can be a disaster if no one is around to stop water from leaking into the surroundings. While setting this up, I'm reminded of overall how shoddy feeling the whole 1/4" pressure system is - but this is done for the purpose of simplicity. A proper plumbed setup would be more robust, but would probably also cost more than the actual new price of the filter system. Often, it takes a couple days of observation/refining connections to insure the 1/4" system doesn't have any leaks. However, once the system is setup properly, it functions wonderfully without any leaks.This system was well worth what I paid - and it will become a part of my filter system. However, moving forwards, any replacement carts I buy will be the 3rd party ones without the key. This system is equivalent to two single ones daisy chained - in a single housing. Since I often daisy chain 4 filters, I only need 2 of these rather than 4 singles.If this comes up again for a discount price, I would most def buy again. I'm really buying just for the housing and the filters that came with it are a bonus. I also buy Culligan/Brita/Dupont housings, if I see them for a substantial discount - with the intention of using non-OEM 3rd party filters after the initial included one wears out.

Just what I needed. Easy to install.

The product is fine except the wrong adapter for the intake side was sent in the package. The compression out put to the filter was to big for the hose. I just went to home Depot but the only one that they had cost me $24. So I was not real happy about that.

Will never blink before purchasing it

It comes with a connector that fits the common sized hose/faucet connectors under the sink. I expected a saddle clamp valve. The little connector is a big plus if you're an apartment dweller and your sink has the right 'knockout' for it, you could install and remove it when you move and leave no trace. On the minus side, the connector does seem to slow the flow to the faucet a bit. I'd prefer to sweat solder mine in with an 'H' formation (T off the copper pipe to a T with a capped leg down to allow large sediment to fall into, and a capped leg up to drill the 1/8" hole in for the saddle valve. That's also fairly easy to cap and remove later, or if the saddle valve fails you can just replace one piece of copper and a cap. I like that the filters are designed so they're bare. You can use a marker, etc, to date when you replace them.