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Author:
terracore (HI)
My water system is rain catchment. Water comes from the catchment tank, is pumped into a pressure tank, and then passes through a 20 micron filter and then through a 5 micron filter before it goes through a UV sterilization unit and then into the house's plumbing system.
The last 2 times I changed the filters the 20 micron filter was mostly clean but the 5 micron filter was clogged with sediment. I only got a few weeks of service from the filters this time instead of the few months I normally get because the water pressure was too low because of the clogged 5 micron.
The 20 micron filter is in an Omnifilter model OB1 Series A housing. It doesn't have a bypass feature. I double checked all the valves in the rest of the system were properly open etc. The 5 micron filter is in a clear housing and I can see the filter is already getting gross after just a few minutes, normally when I change it, it looks pretty new even after a few months.
The sediment in the 5 micron filter housing is WAY larger than 20 microns so its clear the sediment is getting past the 20 micron filter but I'm losing my mind trying to figure out how. I've had this system for many years and this has never happened before. I haven't changed brands, types, or sizes of filters etc.
Any ideas? Thanks for any help you can provide.
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Author:
m & m (MD)
The second component in your filtration is the sump housing. Have you had a close look at the housing head and sump for any deformities, etc.?
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Author:
Wheelchair (IL)
Here's an example. A red blood cell measure about 4 microns. Any debris that measures 5 microns passes easily thru a 20 micron filter. A 10 micron filter would trap a lot more minute debris than the 20.
Best Wishes
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Author:
Wheelchair (IL)
A positive filter should stop flow when the surface of the media is fully covered. A good example of a positive filter can be the gas filter on your car or truck. Most filters for water are not positive unless it is so stated. Some point of use filters that filter up to .5 microns are positive filters.
Much depends on the material used on the filter media.
Best Wishes
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