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Comment by tguvot | Hacker News Reader

pre-filters typically have specified "capacity" in gallons. which is measurable. also if water is very dirty filters get clogged and pressure dropped. it's also measurable.

"post re-mineralization stage" is actually "ph adjustment".

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I know pressure drops. The problem is knowing which filter is the one causing it in particular. Also, filters that are spent at different rates are a PITA. What I mean is if you are going to feed it nominally clean tap water, there's no reason to protect a catridge with equally or more expensive cartridges. Just use the RO filter and be done with it.

you can put pressure guages in between or one of $10 flow meters before system.

RO membrane doesn't remove chlorine iirc or vocs. On the other side chlorine degrades membrane. "nominally clean tap water" can have enough dirt to clog membrane if you don't auto backflush it frequently

It isnt merely ph adjustment... You want some amount of minerals in water for your health, plants, and taste. Changing the PH isnt the concern in most cases, its just part of the result.

Food gives you all the minerals you need. Matter of fact food can cover most of your hydration needs.

True. But have tasted distilled water? Tastes metalic. Probably just my imagination but I feel like it pulls stuff from the mucous in your mouth and tastes like blood.

It is your imagination. I drink distilled water all the time and it tastes great, not metallic at all.

you sure it's distilled? if you measure dissolved solids with a water quality tester does it read 0?

All those filters are specifically made for PH adjustment (you are welcome to look at specs). There are bunch of different formulations depends on how much PH adjustment is needed.

RO makes water more acidic. if water was somewhat acidic to start with, it can get more acidic or become corrosive.

Are you sure that it makes it more acidic? AFAIK it only outputs pure H20, should be neutral. If you feed it alkaline water you'll get "more acidic" water, but the other way if you feed it acidic water.

yes. it removes calcium and magnesium and it makes water more acidic. also i think it starts absorbing CO2 making it even more acidic.

RO doesn't output pure water. if you want pure water you slap DI filter after RO membrane.

you're right, a little oversight from me.

The spec doesn't tell you intent it tells you the resulting product performance.

Ph change is one part of the result, not the goal. The goal is water purification.

i am talking here about post-filters for PH adjustment. their goal is PH adjustments

those for example https://www.freshwatersystems.com/collections/specialty-cart...

or those https://www.freshwatersystems.com/collections/filters-media?...

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