What Are the Downsides of Reverse Osmosis Water in Randolph County?

An RO membrane doesn't know good from bad. It just blocks by size and charge. Lead, nitrates, sodium, PFAS and general dissolved solids get held back. So do calcium and magnesium — the minerals your body actually wants.

That's why some folks say RO water tastes flat, almost empty. The minerals that give water its body are gone. Good news though: most of the minerals in a normal diet come from food, not the tap, which lines up with the World Health Organization guidance on drinking water. We hook up a new unit, and nine times out of ten the first glass gets the same comment about taste.

So what are the real downsides of reverse osmosis water? Three things come up most.

• Mineral loss - calcium and magnesium leave with the contaminants
• Drain water - part of every gallon is flushed away as brine
• Upkeep - pre-filters and membranes are on a replacement clock

A membrane has to get rinsed constantly or it clogs up fast. The rejected stuff leaves as brine through a small drain line into your sink trap. That's just how it works, not a sign something's broken.

How much goes down the drain depends on the unit and your incoming pressure. Low household pressure makes the ratio worse, since the membrane can't push against the back pressure in the tank. Homes on a shared well pump out in the rural parts of the county feel this most, especially in a dry late summer when the pump's already working overtime. You'll hear it as a trickle that never quite stops.

A permeate pump or a better tank setup cuts that waste down noticeably. On a well, that's usually the version we'd fit.

RO makes water drop by drop. It won't deliver on demand like a regular faucet. That's why there's a storage tank under the sink holding whatever it's managed to make so far.

Fill a big stock pot and a couple water bottles and that tank runs thin fast. It takes hours to refill, not minutes. Once the tank, filter housings and fittings go in, a sink cabinet loses a surprising amount of room. We've pulled a tank back out more than once because the homeowner wanted their cleaning supplies back.

Whole-home RO needs plant-room-sized space and usually a booster pump. Point of use is the sensible pick for most houses — drinking and cooking water, not every single tap.

Sediment and carbon pre-filters are there to protect the membrane. They catch grit and pull chlorine out before it ever reaches that thin film. Skip those changes and the membrane takes the hit instead.

Hard water and iron are common on wells around here, and both foul a membrane a lot faster than the manual admits. A membrane rated for years can be done in one if the pre-filters got ignored. Once the cover's off a neglected unit, the sediment filter is usually orange and swollen solid.

Change the filters, then sanitize the tank and lines while it's already open. Takes a few extra minutes and keeps the water tasting clean. Write the date on the housing in marker. Simple trick, works every time.

Take the minerals out and water usually sits a little below neutral on the pH scale. Slightly acidic water can work on copper and older fittings given enough time and contact.

On a normal point-of-use system, this is a small worry. One dedicated faucet and a short run of tubing means very little contact with your house pipes. Whole-home RO is a different story, since every line sees that water. Those setups usually pair with a remineralization cartridge or a pH stage after the membrane.

We see green staining at copper joints in older county homes long before anyone even mentions filtration. Get the water tested before committing to treating the whole house. The test tells you what you're actually fixing.

Match the equipment to the problem. If your complaint is scale on the kettle, crusty aerators and soap that won't lather, that's hardness. A softener or conditioner handles that, and RO won't.

If you're on city water and the issue is chlorine taste or smell, carbon filtration fixes it cheap. If the worry is bacteria on a well, UV disinfection is the answer, not RO on its own. RO earns its place on dissolved solids, nitrates and metals.

Start with a water test, whether you're in Asheboro, Archdale, Randleman or Liberty. Once the results are in, usually the fix is simpler than people expected. Call Gunny's Plumbing at (336) 242-3136 or find us on Google and we'll come take a look.

Reverse osmosis is strong treatment with honest tradeoffs: lost minerals, drain water, slow refill, filter upkeep and slightly acidic output. None of that rules it out. It just means the system should match what your test actually found. For more on how these units work and when we fit them, see our reverse osmosis page. Then call us and we will test your water first.