DuPont WFIR100X High Capacity Refrigerator Filter

I purchased this to replace an in line filter for my icemaker. All connection hardware is included for a 1/4 inch line but no bracket to hang the filter. I purchased two steel 2 1/2 inch conduit hangers from an electrical supply store for $1.63 plus tax. The conduit two hangers are perfect to hang the filter in the basement. This was a quick easy install and the filter seems to work as it should. I purchased more of these filters just to have ready to use. The cost of the filters seem to be very low compared to other filters and the 4,000 gallon rated life is nice.

JustSomeGuy's experience matches mine with these filters.

They're perfectly fine filters as far as I can tell except that they incorporate a little black rubber-like gasket thing that is supposed to be a flow restrictor.

It makes sense to restrict the flow rate through an activated carbon filter to guarantee good "contact time" between the water and the activated carbon so it can do its job properly. If the water blasts through the filter too fast, the activated carbon won't have time to absorb and adsorb the nasties out of the water.

But either the design of the flow restrictors these filters use is flawed, or there's a QC problem at the factory because in my experience, the flow is restricted to (and I'm not exaggerating) a rate where it takes five to ten minutes to fill a standard coffee cup. Probably eight fluid ounces.

At that flow rate, I have no doubt that the removal rate for chlorine, lead, taste-and-odor, etc., is probably quite excellent because the CT is extremely long. But I'm sure this isn't what the manufacturer intended.

If you take the fitting back out of the bottom (inlet) end of the filter, you'll see the little black rubber-like flow restrictor. If you pull that out and then put the connector back in place, the filters will flow like a fire hose. But that's obviously what the restrictor is supposed to prevent. What we want is a nice, gentle flow such that the contact time is long enough for the filter to do its job, but not so slow that it renders the unit useless.

I'm not sure how the design of the restrictor is supposed to work. I think it's meant to be more than just an orifice that creates resistance to the flow. Instead, I think they're trying to be clever and create a system where the harder the water pressure pushes on the restrictor, the more it pushes the restrictor into a conical seating area, so the orifice closes down more at high pressure than it does at low pressure, thus achieving some level of actual "flow regulation".

But it's not a sophisticated enough design to actually accomplish that, and some of them push completely closed, or very nearly so. Or maybe they've had a run of bad restrictors that are softer than they're supposed to be.

Or perhaps they only work properly when installed one direction, and all of mine were in backwards. When I get a chance, I may try reversing the orientation of a flow restrictor to see if that allows it to work correctly.

Whatever the reason, it appears that some of us are getting filters with flow restrictors that render the filters virtually useless. Taking the flow restrictor out increases the flow rate, but defeats the whole idea of getting proper contact time.

I may install an extra valve ahead of the filter, and abandon the flow restrictor so I can adjust the flow rate manually. But that'll cost about as much as the whole filter cost. :)

Du Pont needs to be spot checking some of these as they leave the factory so they can see what's going out.

I've tried three of the five I bought, and all three fail to flow at a reasonable rate, But then again, they're probably all out of the same production run.

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When considering an additional inline filter it will more than double the replacement time for the very expensive installed one in the unit.

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Looks good. Easy to install but was totally defective. Did not flow water. Completely blocked.

Returned for replacement. Will update after second filter arrives.

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I ordered this as a replacement for my current filter. I use it to filter the ice maker water as well as drinking water. It is much less expensive than bottled water!

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