Very  economical and reusable filter
923184
The beauty of this filter is it can be used over and over until its efficiency is done according to the flow meter test. I used this filter style  for years on the 3M 6900PF Air Respirator while doing mold remediation.

 The snap cap on the air inlet allows you to seal it at the end of the day and reuse it again day after day. The flow meter will tell you when it is plugged and makes it an non-arbitrary no brainer decision. You will spend hundreds on disposable filters during the same time period. During demolition they will obviously plug up quicker but can easily go a month during normal cleaning. I always wrote the install date on them to keep track of usage duration..

The whole 3m respirator system provides nice clean cool air blowing in your face but knocks a real hole in your wallet for the initial purchase. But this review is about the high  efficiency filter
2762383
This was a great deal and will last me a while since I only replace the filter once a year. The price couldn't be beat and delivery was super fast. Buy it, you'll save a lot of money.
473149
Work well at a fraction of the cost of genuine replacement filters
3512146
This filter works exactly as advertised.  It catches a large amount of sediment even though our water is supplied by a municipal water system.  They usually last about six months, except when the water dept. flushes the system (usually in late May).  That usually costs us one or two filters.  The Amazon price is about eight dollars less per filter than a local plumbing supply retailer.  We are pleased with this product.
1376830
This works well and is easy to replace. We go through a few of these every winter because our place gets so dry. I'm glad these filters are affordable.
1969076
Great price for a reusable filter.  Fit perfectly in my Waterfurnace.  Quite happy so far as 30 x 32 is a very uncommon size
1544823
Simple and economical filtration system that works well.
4358908
I like the ease of use, the long-lasting filtration system(timing instructions are included), and the value.
1380265
Great filter, it is affordable and I am no longer wasting time rinsing these filters out, but rather I just replace it every other month
3980827
I have found this filter to be as good as more expensive filters at a much lower cost. This is the second one I've owned and I didn't seriously consider any other brand but Green. I get great performance with a minimum of work to clean and renew it.
444584
Using an inexpensive low resistance filter and changing it monthly makes more sense to me than a higher resistance more expensive one. These filters have been just right for the purpose.
2623566
I have a system that requires the MERV 16 filter to be replaced once a year.  The first year, the air conditioning company came to service my new system, they charged me $250 for this filter.  Imagine my joy to find this product on line at less than half the cost.  This is a very efficient system and does a fabulous job of filtering dust and smells.
519439
There are much more expensive filters out there but this one certainly does the job - and does it well - at a good price.  Highly recommended.
1593151
OEM quality filter for a very affordable price. I will use again.
4588625
Well worth the price and is a very nice option when compared to standard filters that cost twice the price.  Little cumbersome to clean but overall well worth the money.
2989017
These little filters are really easy to take out and put in.  They are also relatively easy to clean.  A good purchase.
216619
Seems to work pretty well, it was a little larger than the filters I had used from the store, so I had to replace a piece of foam that functioned as cushion for the side of the filter with a thinner one. No issues otherwise