GLACIER FRESH Replacement Filter for Maximum Under Sink System, Compatible with 4US-MAXL-S01 System,2 Packs

This filter fits perfectly on my filter model 4US-MAXL-S01. Easy to install and water tastes great!

Seamless replacement for 3 M filter. No leaks. Good filter life.No complaints!

Do they work, yes. Does the water taste better, well yes. But do they actually filter according to their specifications, I don't know. I looked on the box description and they said it does everything that the Filtrete filters do but there wasn't any link in the product description to a known, trusted organization where the test results of the filtering action are published. Since there is no other alternative due to low supply from Covid-19 from Filtrete we are stuck with a third party with no affiliation to a testing facility to prove its claims unless Glacier can provide that information.Note added 8/16/21: Caution! High water pressure from provider could cause these filter to stop working. If filter experiences a brief "shuttering" noise before flow stops it is the water pressure. Stop supply, remove, drain, and slowly open valve to a pressure the filter can handle. It took me two tries to get correct pressure. However now flow is a little less & I don't know if its the pressure or if filter is damaged.

Naught these to replace my original Filtrete water filter and they're a perfect fit. The water tastes the same as the name brand filters.

Used this to replace a name brand filter. Water tastes great and flows quickly through the filter. Price is very reasonable. Will buy again.

With the pandemic, Filtrete (3M) discontinued production of the 4us-maxl-f01 filters, so we were at a loss until this came up in our search. It's been installed about 2 months, fits great, and seems to do a good job. Is it as good as the OEM filter? I can't be sure, but it seems sufficient.

3M/Filtrete folks have not been making the 4US-MAXL-S01 for over a year. I called them and they could not give me a date that they might start back up production. This replacement filter says that it filters out the same contaminants as the the Filtrete one. The taste is fine and the cost is 1/2 of what the 'old' Filtrete one cost so I'm going to use these from now on.

We use this in the kitchen for drinking and cooking water.I couldn’t find the original 3M filters but these seem to work just fine.The water in this area is decent quality but this is just for added peace of mind. I might opt for at least a 2 stage filter if my water supply is below average.Easy installation. Good for 3-6 mos depending on how much we use. That’s how long it lasts for our family of 3.