Compare Top Water Filters - Best 7 Undersink Reverse Osmosis Water Filters

Undersink Reverse Osmosis Water Filters with Reviews & Performance Ratings.

There are Two Styles of Undersink Reverse Osmosis Systems - Sump and Quick Change. Which is Better?

The water pressure range that this system operates best under is not wide. City water pressure usually ranges from 55-65 psi. If you have low water pressure, this may be a choice for you to consider.

Top 7 Undersink Reverse Osmosis Water Filters
	Quick Change Systems			Traditional Sump Style Systems

Brand/Model	Watts 11" Quick Change RO	Watts Premier RO-PURE System	CUNO SQC 3 HF	Crystal Quest Thunder 2000C 5-Filter	Watts Premier Zero Waste	Pentek RO 3500	Hydrotech 3 Filter RO
System Price	$299.99	$268.99	$359.99	$279.00	$429.98	$259.00	$254.99

Filter Change Cost Over 2 Yrs	$224	$191	$297	$253	$123	$179	$280
Filtration per Day	50 Gal	50 Gal	33 Gal	50 Gal	24 Gal	7.6 Gal	50 Gal
Smallest Particle Size Filtered The lower the micron rating the more particles the water filter will trap	.0001 mic	.0001 mic	.0001 mic	.001 mic	.0001 mic	.0001 mic	Not Rated
eFilterWater Review Grade eFilterWater Reviews the systems we sell for the following: Taste of water produced Appearance/size of system Ease of installation Ease of changing filters And we give it a grade to tell you what we think, so you don't get any surprises!	A	A	A	B	B	B	B
Separate Tank	4 Gal	3.2 Gal	2.6 Gal	3.2 Gal	3.2 Gal	3.2 Gal	3.2 Gal
Warranty	1 year	3 year	10 year	1 year	1 year	1 year	2 year
Removes
Chlorine	> 99%	Not Reported	96.8%	99.9%	Not Reported	> 88%	Not Reported
Lead	98.8%	98.8%	98.6%	97%	98.6%	98.7%	Not Reported
Cysts/Bacteria	99.99%	99.99%	99.99%	90%	99.99%	99.9%	Not Reported
VOCs	> 99%	Not Reported	Not Reported	Not Reported	Not Reported	Not Reported	Not Reported
TDS	97%	97%	96%	99.9%	96.4%	90.2%	Not Reported
Operating Pressure Range Operating pressure range is the min and max range of water pressure that the system will operate under for optimal production/performance. Most homes on city water average between 55 psi - 65 psi of static water pressure. More water pressure is not necessarily a good thing for some systems.	35-100 psi	40-85 psi	40-100 psi	30 - 60 psi	40-100 psi	40-100 psi	35-100 psi
Brand/Model	Watts 11" Quick Change RO	Watts Premier RO-PURE System	CUNO SQC 3 HF	Crystal Quest Thunder 2000C	Watts Premier Zero Waste	Pentek RO 3500	Hydrotech 3 Filter RO

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Quickly scan the comparison of best undersink reverse osmosis water filters and see the best rated brands. All performance claims are per manufacturer brand literature that documents the certified claims of each undersink reverse osmosis brand.

Not all models of undersink reverse osmosis water filters are included in this comparison. Not every undersink reverse osmosis brand has documented performance claims. Some brands make exaggerated claims in their literature and on company web sites that did not match their "certified claims". Only performance claims that have been certified by NSF, UL or the CA. Dept. Of Health have been included in the comparisons below.

Companies that make uncertified claims are heavily restricted as to how and where they can sell their products. CA, WI, IA, and several other states, prohibit uncertified claims.