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CBS Water Softener with ZEE Pro PreFilter
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CBS OnliSoft Salt-Free Water Softener Alternative with ZEE Pro PreFilter


RKIN CBS Whole House Salt-Free Water Softener Protects appliances and plumbing from harmful hardness build-up.

Perfect for homes with 1 - 2 full-time residents.

Compact, space-saving design.

Certified components.

CBS OnliSoft Pro Compact 5 GPM Whole House Filtration System Specs







Connection Size

1” NPT Connection

Max working pressure

120 psi (8.3 bar)

Max working temperature

113°F (45°C)

Min working temperature

39.2°F (4°C)

Included Parts List


OnliPure Saltless Water Conditioner Cartridge


5 Micron Sediment Filter Cartridge


Filter Housings


Wall Brackets with screw sets


CBS Housing Wrench


Teflon Tape


O-ring lubricant


Install Instructions:

  1. Install brackets to the wall using appropriate fasteners (included).
  2. Once the bracket(s) is(are) mounted, you can now attach your plumbing to the INLET and OUTLET with 1” male threaded adapters (not included). (Plumbing a shut-off valve prior and a bypass around the unit is recommended).
  3. Lubricate the filter housing O-rings with included lubricant.
  4. Install all the cartridges by matching them to the appropriate housing as marked on the housing head in the following sequence: IN=>ZEEPRO(sediment filter) =>ONLISOFT=>OUT
  5. Snugly tighten the filter housings with included wrench, do NOT overtighten.
  6. Slowly turn on the water main to fill the housings.
  7. Your system is now ready for use.


If this or any other system is installed in a metal (conductive) plumbing system, i.e., copper or galvanized metal, the plastic components of the system will interrupt the continuity of the plumbing system. As a result, any errant electricity from improperly grounded appliances downstream or potential galvanic activity in the plumbing system can no longer be ground through contiguous metal plumbing. Some homes may have been built in accordance with building codes, which actually encouraged the grounding of electrical appliances through the plumbing system. Consequently, the installation of a bypass consisting of the same material as the existing plumbing or a grounded “jumper wire” bridging the equipment and reestablishing the contiguous conductive nature of the plumbing system must be installed prior to your system use.


ZEE Pro 5 micron sediment filter cartridge should be replaced every 6-12 months or as needed. Low water pressure is a good indicator of an exhausted cartridge and a need for replacement. Replacement cartridges and supplies can be ordered online at or by calling 800-803-4551. The model number for the sediment replacement cartridge is WH-RC-BB-20-5M. The OnliSoft media in the OnliSoft Cartridge is non-absorbent. It will work for a lifetime and doesn't require replacements or maintenance.

 Cartridge Replacement:

  1. Turn off the main water supply
  2. Open the nearest faucet (leave it open)
  3. Apply wrench to housing & turn clockwise to loosen (to the left)
  4. Remove and discard old O-ring and cartridge
  5. Unwrap and install a new cartridge centering on the standpipe
  6. Install a new O-ring lubricated with food-grade silicone grease
  7. Reinstall housing and tighten (Do not overtighten)
  8. Turn the main water supply on slowly to allow the system to fill, the air will expel through the open faucet.
  9. Run water at the nearest faucet for 10 minutes to expel any carbon fines.
  10. Close the faucet and check for leaks.


For more information on our warranty, please visit

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