Due to a recent freeze while we were away, the filtration system in our bay got destroyed...Looking to use an external one now and probably under sink.As full timers moving to unknown water systems all the time, what are your recommendations?

I have a sediment and a carbon filter. I test the faucet water before connecting the RV. If OK the tank will be full when we leave.

We moved ours indoors to under our sink as well due to getting to cold in our rig's wet bay. Don't find a need to filter shower, toilet, or dish water although we have an external filter we could hook up, under most circumstances we bring city water from home and use our FW pump. We get our dual filtration system/filters from Lowes, Home Depot, good variety on Amazon if you don't want to hassle with big box stores. Fittings can be had from locations above to easily integrate into plumbing under sink. After all that, we drink bottled water and use filtered water primarily for cooking.

If you get a whole house filtration system, I recommend getting a sediment filter only. Do not get a filter that removes chlorine. The chlorine in municipal water will help to keep your supply lines and tanks sanitized.Reserve the chlorine removal and final polishing for just the sink. In our case we have just settled on using a Brita.

Good point Jim. Our charcoal filter is not used to fill the tank but is used for hookups. This setup works for us since we often use tank water which keeps the rig sanitized.I don't fill the tank if the water is questionable and carry water bottles as backup.

You need to figure out what you want to filter and what your budget is. The best are reveres osmosis filtration systems and are expensive.The blue Camco in-line filters are 20 micron and won't filter out any nasties. They're for removing some odd taste at best.Our Walmart recently stocked a filter that works like the Camco but is a 5 micron filter. That's good, but if you're worried about nasties then you really need something like a 0.5 micron filter.So it depends on the quality of your water source and what you're trying to remove/

What are you using for external water filtration?

TechWriter
Explorer
Apr 07, 2021
philh wrote:
TechWriter wrote:
Plus, you can plumb an RO system so that the waste water goes back into your water tank so there's no waste.

no issues with the "dirty" water going back into the tank?

Not really. RO systems have multiple stages: typically 2 or 3 filters (sediment, carbon block, etc), then the RO membrane itself, and finally post filters like "water polishing" or adding minerals.

The waste water or brine comes from the RO membrane so the water has already passed through filtration that most RVers use anyway.

If anything, the RO brine is hard water, not "dirty". TDS (Total Dissolved Solids) levels in ppm are usually used to measure RO system water quality. For example, one of my measurements was . . .

- "Fresh" (incoming) water: 242 ppm
- RO treated water: 34 ppm
- RO Brine: 202 ppm
TechWriter
Explorer
Apr 07, 2021
CA Traveler wrote:

Returning the unfiltered RO waste drinking water to the tank adds to the tanks contaminates which increases as the tank empties. So increased filter replacement.

Depends where you put your RO pre-filters. Mine filtered water before, not after, the water hits the holding tank. So no strain on the filters.
DancinCampers
Explorer II
Apr 08, 2021
I run off my tanks exclusivly. A 10 Micron sediment filter, then a 5 micron sediment filter, then a 5 micron carbon filter, then a 100 gallon/day RO membrane.

In New Orleans I have 300 + PPM TDS in, 12 PPM out.

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What are you using for external water filtration?

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