Dear_one wrote:
I used a Brita pitcher before the town added the RO filter. In-line filters do not normally leak any more than plumbing does. If they do, repairs are better than despair. It is not unusual for a farm to have two or three stages of treatment for their well water.
Yes, if the connections are done properly they won't leak. Ours was the type that screws onto the end of the tap. I can't remember whether the problem was mismatch or bad design, but we couldn't find an easy fix, so it was simpler to go over to the jug type. I don't suppose it made much difference to the labour cost.
One thing we discovered was that (for our water) the maker's estimated filter capacity was way too optimistic. They must have used soft water for their tests. I was surprised because it's unusual for a manufacturer to understate how often a consumable should be renewed. I get the impression that a soft water supply isn't that common - certainly everywhere I've lived has had hard water. And a non-technically minded user would have no way of knowing when the filter was expired. Luckily for me, most of our filtered water goes into a kettle and gets boiled, so it's just a matter of watching out for the first traces of limescale in that. We also got one of those push-button counter things so we can easily keep count of the number of fills of the jug. In our case we get about 50 fills out of a cartridge, and that always correlates well with the limescale in the kettle.
It's often struck me that we could cut the cost dramatically if we had a cheap way of removing the calcium before putting it through the Brita filter. I'm sure they used to have very cheap anion and cation exchange resins in our school chemistry department, and those could be regenerated very easily with HCl and NaOH. But I foresee 3 possible problems:
1. It might turn out that the calcium has to be exchanged for sodium, which would waste the Brita filter's capacity just as much.
2. The resin itself, being plastic, might leach out some toxin that's as dangerous as the heavy metals we're ultimately trying to remove.
3. Vendors would probably laugh at my ideas and try to push me into buying into something much more expensive, without clearly explaining why I should, and it seems unlikely that the things I wanted would be readily available off the peg.
That probably explains why I haven't pursued my idea any further yet. But I'd love to know what, if anything, is wrong with it.