It is highly recommended that your system is sanitized each year. Just follow these 16 steps*:

  1. Turn off incoming flow to the system.
  2. Open the faucet where the filtered water comes out (to relieve the pressure).
  3. Remove and open the filter housings. Be careful not to spill!
  4. Remove cartridges from housing.
  5. Remove and rinse the O-ring in the filter housings. Return O-ring to housing. FYI: Some manufacturers recommend replacing O-rings each year.
  6. Inspect cartridge for sediment buildup. If high sediment buildup is present it may be time to replace the cartridge.
  7. Clean filter housings with warm soapy water and a brush. Also, clean inside the filter housing cap.
  8. Prepare sanitizing solution in a clean bucket as follows: 1/3 teaspoon of unscented household bleach for 1 gallon of water.
  9. Add 1 cup of the sanitizing solutions to each filter housing. Replace the housing cap (DO NOT replace the cartridge)
  10. Replace housing into the system and run the system, letting the housing and system to fill with water.
  11. When water starts to flow out of the faucet, close the faucet.
  12. Allow water to flow through the housing and system for 30 minutes.
  13. After 30 minutes shut-off incoming flow, remove housing(s), and discard sanitizing solution.
  14. FYI: Place the carbon block cartridge (with netting) in the first housing, and the KDF/GAS cartridge (with plastic casing) in the second.
  15. Replace the housings with cartridges back intot he system, open the valve and allow water to flush the system for five minutes.
  16. Close the faucet and check the rates.

*See these steps in action below:

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Filter Cake

The filter cake grows in the course of filtration, becomes “thicker” as particulate matter is being retained.

Many filter users look at their cartridge filters, see that they are dirty, and immediately change the filters.  Although on the surface this logic appears to be good, it is probably costing you money.

Cartridge filters are designed to remove particulate matter in the body of the filter as well as on the surface.  The particulate that is deposited on the surface of the filter (commonly known as Filter Cake) acts as a filter in its own right and as the depth of the filter cake increases the filter becomes more efficient.  In effect the dirt is filtering out the dirt.

By allowing filter cake to build up on the filter the life of the cartridge filters will also be extended, thus reducing the filtration cost for each liter filtered.

Pressure Gauges

The easiest way to tell if your filters are doing the job is by having a Pressure Gauge in the inlet and outlet sides of the filter vessel. It will tell you, 1) If the filter is bypassing, 2) When the filter needs to be changed, and 3) About how much life before change out is necessary.


You can take advantage of this life extension by installing a pressure gauge both before and after your Filter Housing and measuring the pressure of the liquid before it goes through the filter element as well as after the liquid has been filtered.  The difference between the readings on both gauges is referred to as differential pressure.

You will note that the longer the filter element is in the housing the greater the differential pressure will become because greater force is needed to move the liquid through the cartridge.  When the differential pressure reaches 20-30 psi you should change the filters.

If you allow the pressure to exceed the 20-30 psi differential you will run the risk of channeling particulate through the body of the filter thus bypassing the filter and negating the purpose of the filter.  When channeling occurs the differential pressure actually decreases.

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Slow the Flow for Efficiency

With in-depth cartridge filters, the slower the flow, the more efficient the cartridge is and the longer the user can go between change-outs. At, we typically size housings to start out with a clean differential pressure of two pounds or less. You will find that many people in the filter business will quote housings that are undersized for an application so that they quote the lowest capital equipment cost.

The Pressure Drop

The differential pressure (pressure drop) across both the cartridge and housing must be considered cumulatively. The pressure drop across the housing differs from housing to housing, but in most cases, it can be obtained from the housing manufacturer.

Flow Rates

Assuming a cartridge vessel is designed for cartridges with a one-inch inside diameter, keep in mind that the flow through the bottom of each filter should not exceed 15-25 gallons per minute (for membrane pre-filters, try not to exceed 15 gpm). These flow rates should not be exceeded because turbulent flow is created on the interior core of the filter, which frequently cause unloading of contaminant from the filter media.


Always consider the viscosity of the material to be filtered when sizing filters or vessels. Also keep in mind that the viscosity of most materials varies depending on temperature. If you have an application where the customer does not want to go over a certain differential pressure and the temperature of the product can go through a wide swing, be careful to find out what the viscosity of the liquid is at both extremes of temperature.

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