Doby Water Purifier Cartridge Set

This is the replacement cartridge set for our very popular Doby whole house water purifier. 

You will receive two 4.5 x 20" cartridges. 

CARTRIDGE ONE:

A 4.5 x 20" 5 micron carbon block water filter cartridge to treat chlorine, taste and odour. 

>26,000 gallons @ 3.0gpm or 12 months; whichever comes first
Certified NSF/ANSI standard 42 NSF
Certified by ISO 9001
Performance tested and verified by independent laboratory testing
We send out an email every 6 months to remind you to check your filter performance.

CARTRIDGE TWO:

A 4.5 x 20" 0.2 micron NanoCeram pleated cartridge.

Specifications

Surface area - 17ft / 1.58m
Dirt holding capacity - 1401.4g
Dimensions - 4.5 x 20
Suggested flow rate - 20gpm / 76 lpm
Maximum flow rate - 50gpm / 133 lpm

Operating instructions

Temperature - 39-180F (4-82C)
pH range - 5 to 10
Terminal pressure drop - 35 psi (2.4 bar)
Maximum salinity - 200,000 ppm

Retention characteristics

Silt density index (SDI) < 0.5
Turbidity Reduction: < 0.01 NTU until Terminal ?P (35psi / 2.4 bar)
>99.9% efficiency at 0.2 microns (latex spheres)
Dirt Holding Capacity (DHC) 82g/ft
Cyst Retention: > 4 LRV
5 LRV Klebsiella terrigena retention

WHY DO I NEED TO CHANGE THE O-RING?

You can tell if the seals start leaking, which is obvious, I know.

Even if there are no leaks you may find that the profile of the O ring becomes flattened because of prolonged time under compression. The cross section should be round and if it's not it may not seal easily.

However, I recommend that you replace the O rings every two or three years as a precautionary measure.

One of the main reasons for changing O rings periodically is that as they age and compress, the housing bowl needs to be tightened excessively. That leads to difficulty loosening the bowl from the cap next time the cartridge needs to be replaced.