It may be more efficient - the first filter will do most of the filtering of larger particles and the second filter will remove smaller particles. In other words, you don't want the second filter clogged up with larger particles that a coarser filter can effectively remove.
I have seen some "water softener filters" - they essentially have ion exchange resin but need to be replaced when exhausted. The more typical situation is an actual water softener that recharges the resin periodically by flushing a salt or potassium brine solution across it.
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Originally Posted by TrudyM
Ok I am thick why would a system have two sediment filters. Also is the filter that is suppose to take out hard water ions work or do you need a salt system?
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