I've purchased the D40 filters in the past.They are good to reduce lead and other major contaminants in the water. However, the water flow is quite reduced due to the extra level of filtration.They only last for 4 months and the flow decreases as you use the D40.In contrast, the D30 lasts 12 months, still has a great filtration profile, and the water flow is much faster and easier to cope with.In fact, I can hardly notice any difference between the hot water and the cold water now, compared with when I had the D40, and the cold water was annoyingly slow.
I recommend this filter over the more expensive D40 for everyday use, unless you have tested your water and found it to have lead.Then I'd use the D40 for health reasons, but not until then.There is no added benefit to the D40 in terms of water taste, or protection from microorganisms, compared with the D30.
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Product Description:
D30 replacement filter cartridge reduces greater than 99.95% cryptosporidium and giardia cysts, chlorine, sediment, bad taste, and odor. 0.5 micron (nominal) filtration. CBC activated carbon block construction. Filter life up to 12 months or 1000 gallon.
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