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I changed out both elements in my electrc water back in late August. Had to change the bottom one out again today.

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[-] deranger@sh.itjust.works 30 points 2 months ago* (last edited 2 months ago)

You can’t filter out ions of calcium like that. A huge reverse osmosis system for the entire home would be prohibitively expensive. I used to live in an area with very hard water and everyone had water softeners. You only need to buy the salt every few months and it’s not too bad. RO filters were only connected to a tap on the side of the sink in the kitchen - those membranes aren’t cheap.

[-] frezik@midwest.social 14 points 2 months ago

RO also puts about four times as much water down the drain as it filters. A whole house RO filter is extremely wasteful. You don't need to be filtering every toilet flush.

[-] BigDanishGuy@sh.itjust.works 6 points 2 months ago

Yeah, I think most people, myself included at one time, are more fascinated by RO than we understand the practical considerations.

Use RO locally at a single tap in the house, if the water quality warrants it. Perhaps add a desalination unit before the water heater, or centrally if you have some very hard water. But a central RO? Sounds expensive.

I've considered a central RO for prepping purposes, but even then a gravel/sand/active charcoal filter, followed by a UV-C mercury lamp, would probably be more cost effective, and easier to maintain without access to replacement membranes.

this post was submitted on 12 Oct 2024
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