water filter lifetime?
3M B1 Under Sink Filtration Replacement Filter
RV Water Filters Cartridges
Can water filter lifetime be discerned by the way it functions? I mean, if I don't know how many gallons have passed through it, but I know it is less than (say) the 2000 gallon rated flow-through, should I discard it after the given lifetime of (say) 6 months or 12 months or whatever is given in the specs, if it seems to be working fine? Or will it clog up or slow down or something when it is used-up?
Or - is something bad happening inside the filter after its rated time of 6months or 12 months or whatever, regardless of gallons passed through?
IOW - How do I understand the rated lifetime compared to gallons passed through, in terms of usability of the filter?
Question ID: 2034856 Status:
Open Mar 27, 2016 - 03:06 PM
1answer
Answer
Mar 28, 2016 - 06:08 AM
For RV's that are not used as full time living, it is suggested to replace the filter every 6 months or at the beginning of each season. (if you store your RV due to winter or off season conditions) The reason they use this number is because it is very difficult to measure water quality at the various campgrounds you may have visited. Since RV filters use activated carbon to filter out some of the harmful things in water, that activated carbon can also grow bacteria. Water flowing through the filter usually contains some amount of chlorine which the carbon removes, but also kills that bacteria. When a filter sits for long periods of time without fresh chlorine, bacteria is more likely to grow. The NSF certification means it uses a bacteriostatic material to combate this, but over time this becomes less effective. So time become more of a life ending number than the number of gallons run through the filter does.
A filter can begin to clog up and reduce water flow in very poor water conditions, but again time will be more likely the indicator than gallons capacity.
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