I’m thinking of putting in an under-the-sink water filter. I am wondering when I winterize my RV, what do I do about the filter? Do you have any recommendations on what type or brand? We are part-timer RVers that go out a week or two at a time. —Chuck, 2019 Grand Design RSL303
If you are just wanting to filter the water going to the faucet in the sink, you can use a smaller residential version found at home improvement stores or on Amazon here.
You can get a single stage or three stage, depending on the level of filtration you require. Many RVers will put an inline filter at the faucet outside to filter all the water coming in for sediment, lime, and rust. You can get the in-line version that is easy to assemble. Or I like to use the residential style as I can replace the cartridge for about $4 rather than the entire filter, as campgrounds in my area have very hard water and plug a filter pretty quickly.
Another option is to get a portable water softener that not only softens but filters as well.
And the ultimate is a Clear Source system that filters almost everything!
Test the water
What you might want to do is test the water to find out what type of minerals and level of hardness it is. All home improvement stores have kits that will show hardness, nitrates, ph, copper and several other items.
If you go with the under-the-sink brand, as you indicated, take out the filter and let it air dry at home. Some filters come with a bypass plug you can insert where the canister was. This is good if you are using RV antifreeze, as I wouldn’t want to fill the canister with the pink stuff. You definitely do not want to get the pink stuff in the filter. If you are using air to blow out the system, I would still take the filter out and let it air dry as freezing would most likely weaken or destroy the inner filter.
Filter for drinking water
One last recommendation. If you are looking to just filter water for drinking, I used to go and buy 5 gallons of water from a grocery store that has a Culligan filtering system. However, it was quite a pain hauling that heavy jug back out and into the camper or at home. I use filtered water at home as I don’t like the taste of soft water. Even with an under-sink filter we were getting scale in the coffee maker. I started using the Brita filter and it works wonderfully. Here is the model I have. I take it camping with me, as well.
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