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Road Map to RVing => Full-time RVing => Filtering Water



water Filtering Water Part 2

More About Filters

As you may have noticed when shopping for filters, there are several designs, micron sizes, and uses.

  ~Pre-Filter~ Sediment Filter Cartridges
$5 or less each

These are all 10" tall cartridges for standard RV housing.

Sediment cartridges are used to catch dirt, sand, mineral or metal particles.  Lower micron ratings mean smaller particle removal.
1, 5, and 10 Micron sizes. Not every supplier carries the small Micron size.

Pleated filter
Pleated sediment filters can be paper based or some sort of fiber or plastic based material. The pleated ones you may find in a store are likely to be paper and are not designed to be reusable. They are very attractive to bacteria during storage.

 Polypropylene and polyester models are reusable and can be hosed off and reused until they don’t pass water well enough after cleaning. No significant difference over throwaway units, unless you happen to wish to go ‘green’ and throw less in the garbage.

  ~Pre-Filter~ Carbon Filter Cartridges
$5 to $20 each
Carbon cartridges remove contaminants that affect taste and odor by utilizing activated carbon in the form of solid block or granular carbon. .5, 1, 5, and 10 Micron sizes. Not every supplier carries the small Micron size.  

Solid block is the current favorite for RV use.

The 1 Micron and the .5 Micron version removes cysts and has natural resistance to stagnation due to the fiber material.

  Other Filters and Information    

RO Membrane
$45-$85 each

RO Filter


At the heart of the reverse osmosis system is the RO membrane. They are typically installed in a cylindrical housing that is similar to a filter canister. As with other filters, the material they are made of makes a big difference in their performance and longevity.

Membranes are rated in angstroms, which is much smaller than sub-micron. This is why they can remove TDS that is totally dissolved, and why they need plenty of pressure to work efficiently.

Several sizes are available, with flow recovery rates of 8 to 75 gallons per day. If the RO tank is a 2 gallon, then the lower-rated membranes would be more economical.

If the feed water is pre-filtered to remove sediment and chlorine, the membranes last a long time.


Inline Filter
$20-$30 each



This inline filter reduces bad taste, odor, chlorine and sediment in drinking water. Most RV supply stores sell the 100 micron fiber filter so the water flow is not impeded. This durable in-line, exterior mount filter has a wider body to increase flow. Includes flexible hose protector to minimize kinking that impedes water flow. Use outside connected directly to the hose, or inside under the sink.

This type of filter is also available in 25 Micron size which provides better filtering.


Filter Housing
$20-$30 each


Brass adapters

White housing


For RV use, filter housings are usually 10 inches high and fit the standard filter cartridges. They do come in various sizes and diameters, clear or solid materials. For outside use, clear is not recommended due to algae growth.

This blue color usually designates the largest diameter in the 10-inch size, available wherever household pumbling supplies are sold. Brass hose adapters are required to mate this to 1/2" or 3/4" hoses.

There is a smaller diameter 10-inch housing that is usually white in color sold at RV suppliers. This usually comes equipped with the brass adapters for standard hoses..

The housing wrench shown here is needed to open the housing. It may be an extra purchase.


Housing Stand

Housing Holder

For outside use, this is only one of the many creative ideas for holding the filter upright and off the ground.

For Boondockers

It is possible to use an RO system and divert the brine back to the fresh water tank by adding the Boondocker Option.

The most common filtration systems that boondocking enthusiasts like to use are single or dual canister systems. Purchasing quality canisters that hold up while being stored is important.

Filters made of plastics or fiber are naturally resistant to stagnation, and those with additives like KDF or silver will prevent stagnation in storage.

Waste Water From an RO Unit

From Rick at the RVWaterFilterStore.com:

With a new set of filters, the amount of water that goes down the drain (or possibly back to the fresh water tank) depends on the size of the restrictor your system has placed on the water source. The ratio might be as little as 3 to 1, or as much as 4 or 5 to 1.

The available pressure to achieve the best ratio needs to be 60 psi. Whenever the pressure feeding the system is less, the production of RO water falls off, but the waste water remains pretty much the same.

In those situations, the ratio would become much greater. The closer the pressure gets to 40 psi, the bare minimum for the RO to work at all, that ratio could become as much as 10 to 1, or more. As you can see, in an RV with various changes in water quality and pressure, the performance of the RO varies.

Water Hose

RVWaterFilterStore also makes custom hoses. As you probably have already experienced, very few RV supply stores carry high-pressure water hoses.

From Rick at the RVWaterFilterStore.com:

Everybody would like to have good hoses for their RV, and ours is unique. We make them in any length, which is handy for the RVer. They are 200 psi rated for pressure and do not swell or kink. They last for many, many years. I am still using hose that is over ten years old and I expect them to last much longer. They are equipped with solid machined brass fittings that are crimped on.

Glossary of Terms

Bottled Water Recall Alert

The recall affected all spring water products from Niagra's Hamburg and Allentown, Pennsylvania, facilities.

The recall includes all spring water products purchased between June 10 at 3 a.m. and June 18 at 8 p.m. from the two Pennsylvania operations, and the brands affected are: Acadia, Acme, Big Y, Best Yet, 7-Eleven, Niagara, Nature’s Place, Pricerite, Superchill, Morning Fresh, Shaws, ShopRite, Western Beef Blue and Wegmans. Stores recalling the water bottles alongside Niagara Bottling include Wegmans, ShopRite, 7-Eleven and Acme.

Read the rest of the story HERE.

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