A home water filtration system will give you peace of mind. Universal Water provides convenient online ordering for all of our filtered water solutions. Choose from whole house water filtration systems or under counter water filters. You've found the right place if you need a counter top water filter, refrigerator filter, shower filter or camping water filter.


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Counter Top Filters
Under Counter Filters
Refrigerator/Ice Maker Filters
Shower Filters
Whole House Filters
Well Filters
Camping Water Filters
Reverse Osmosis
Arsenic Water Filters
Fluoride Water Filters


Replacement Cartridges
Water Filter Faucets
In-Home Water Test Kits
2 Gallon Refrigerator Bottle
Drinking Water Bottles-32 oz.
Under Counter Water Chillers
Countertop Water Coolers/Heaters/Carbonators
Diverter Valves
Filter Housings
Wonder Shower
Built-in Coffee Makers
Coffee Servers
Water Softeners
Home Car Wash Spot Free Rinsing System


How Our Filters Work
Filter Cost Comparison
Technology Comparison
Protocol Test Results


The Ster-O-Tap water sterilization cartridge consists of a bundle of hydrophillic (water loving) capillary membranes. These membranes are shaped like hollow fibers, closed on the feed side. The water follows a path from the large pores on the outside wall to the small pores on the inside wall. The inside wall of each fiber has very tiny pores - 0.15 microns in diameter (0.00015 mm). These pores are several times smaller than the smallest bacteria, which is about 0.4 microns in diameter. When water flows through these pores, an unparalleled removal of >99.999999% (8 log) of all bacteria is achieved. This prevents harmful bacteria and cysts (like e-coli, crypto and giardia) from reaching your faucet and provides you the protection you need.

The patented Ster-O-Tap low pressure membrane technology achieves this remarkable micro filtration with extremely high flow rates at low feed pressure. There is very little pressure drop as with other technologies, such as ceramic. It requires less than 14 psi for a 1 gpm flow.

Ster-O-Tap capillary membrane cartridges have been tested and certified by the NSF International against ANSI/NSF Standard 42 for Particle Reduction (Class 1) and ANSI/NSF Standard 53 for Cyst and Turbidity reduction.

Ster-O-Tap® Membrane Features
o Capillary membrane with asymmetric micro-porous structure, internally skinned
o Very high flow rates at low pressure gradients
o Narrow consistent pore size ranges
- micro filtration  0.15 micron 
o High surface porosity and overall porosity (> 85%)
o Permanently hydrophilic with neutral surface charge for low fouling characteristics.
o Withstand feed- and backwash pressures up to 7 Bar - > 105 PSI
o Chemical resistant to allow for a wide range of cleaning agents, incl. chlorine
o Heat resistant up to 120 oC (248 oF)

A Ster-O-Tap®  Micro (MF) filtration cartridge is composed of a bundle of many capillary membranes, which are sealed in a housing, with the membranes closed on the feed side. The feed water follows a path from the large pores on the outside wall to the small pores on the inside wall for high flow rates at low pressure (US Patent: 5.895.573 - European Patent: 97942301.9)

Electron Microscope photos of  Ster-O-Tap®  capillary membrane


Cross section capillary membrane (156x)

Outside wall capillary membrane (5000x)

$129.99 with FREE shipping in the contiguous U.S.!






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Counter Top Filters Water Information How our water filters work
Under Counter Filters Fluoride in drinking water Water Filter Comparison
Refrigerator Filter Water Treatment Filter Cost Comparison
Shower Filters Cysts in drinking water Proper Hydration
Whole House Filters Giardia Safe Drinking Water
Replacement Items Lead in drinking water NSF-53 Protocol test results
Portable Water Filters Chlorine in drinking water Painting Supplies
Water Softeners Chlorination By-Products Water Chillers
Faucet Water Filters Pesticides in drinking water Fluoride Water Filters
Water Filters Cryptosporidium Home Water Filtration System