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What the filters remove

Tuesday, 9 June 2015 9:28:29 AM Pacific/Auckland

The filter cartridges we use are industry standard. They are designed to meet NSF42, a USA water quality standard. The cartridges need to: 1. filter out particles bigger than 5 micron (so that the living nasties cannot hide as they travel down the UV chamber). 2. remove particles that make the water too murky (so that the UV light can penetrate and sterilize the reproductive organs). Apart from these critical functions, people want their system to do more...Read More
0 Comments | Posted in Blocked Filters By Wayne Cameron

Pressure Loss

Monday, 8 June 2015 11:43:08 AM Pacific/Auckland

I don't have enough pressure!

Typically you will lose only a few psi with new unplugged cartridges.

Pressure drop (dP) is a function of flow rate and restriction. The faster the flow and the greater the restrictions, the greater the dP.

Restrictions from plumbing distances and diameters are as important as how plugged your filters are.

Equally micron rating affects dP. To be effective, UV sterilisation requires filtration to at least 5 micron.

Trying to solve dP by using larger micron cartridges (say 50) defeats the purpose of the system - to keep you safe.

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0 Comments | Posted in Blocked Filters By Wayne Cameron

Blocked Filters

Monday, 8 June 2015 11:34:07 AM Pacific/Auckland

Plugging is the technical term for blocked filters.

  • The pores in a paper cartridge fill up with silt/mud/decayed leaf/pollen. Soaking and scrubbing can remove most of the plugging, except pollen. 
  • Look at the poly (density) cartridges end on; they visibly plug outwards (darkness spreads outwards from the smaller circumference insides).
  • Carbon cartridges simply stop working; the carbon surfaces get coated, and cannot touch the passing water.
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Comments | Posted in Blocked Filters By Wayne Cameron

Filter Cartridge Life

Monday, 8 June 2015 11:25:02 AM Pacific/Auckland

Short Answer: 6 months

  • Cartridges 'plug' (fill up / block) at a rate that depends on how much water you use, and how much debri is carried in the water. 
  • A very clean water supply such as 'city water' - change annually. 
  • A very dirty supply; such as a silt laden river; can plug your cartridges in a month or so.
  • Roof/tank water typically 6 or more months
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Comments | Posted in Blocked Filters By Wayne Cameron

4 Item(s)