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Drinking water of millions of Americans contaminated with ‘forever chemicals’
(www.theguardian.com)
this post was submitted on 17 Aug 2023
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After having one of those undersink systems, I can say they work, the water is very pure coming out, only issue being that it's basically pure water - no minerals, no anything - ~~some issues there with actual hydration since drinking pure water can kill you - look up hyponatremia.~~
edit: might not be the case - see reply
The principle is the same as for the more expensive systems, what you don't get is
If you have around 45 psi of water pressure on your tap, it's good enough, but don't expect to be bathing in the stuff, it takes quite a long time to get usable quantities and I think you get 1L RO water to 4-5 L 'waste' water. Higher pressure - higher efficiency and speed but check the pressures the membrane is rated for. Also if your water is chlorinated you need some activated charcoal pre-filters because chlorine harms the membrane.
Maintenance should also be done regularly to change prefilters once every 3 months and the membrane once every 9-12 months. And it can get slightly messy on cheaper models.
This is a myth. You cannot be harmed from pure water, even distilled water. Lab-pure molecular water tastes like shit, anyways.
https://medicalsciences.stackexchange.com/questions/20837/can-drinking-ultra-pure-water-be-dangerous
The difference between tap and 100% pure water is so slight that it'll never cause hyponatremia. What WILL cause hyponatremia is drinking way, WAY too much water in a short span of time. That'll dilute your blood (hyponatremia) from ions that you need as your kidneys desperately try to get rid of all the water. This is entirely mitigated by eating foods around the same time that are not entirely deficient in minerals like salt (pretty much all foods).