CKMA is committed to providing high-quality services after installing the water purifier, such as filter replacement frequency.

From Contract to After Sales Service

800G / 600G / 400G RO SYSTEM
An 800/600/400G RO system is needed to exchange filters only once every half year. Depending on the water quality, we can come to check for the maintenance when needed.
  • We collect our charge when we visit to exchange filters.
Model Rental fee Tank
Amount of purified water per day
Water flow
400G RO SYSTEM 1,100B No 1,520L 1L / min
600G RO SYSTEM 1,300B No 2,280L 1.6L / min
800G RO SYSTEM 1,500B No 3,040L 2.1L / min
  • Water quality is the same, but the amount of water that the water purifier generates per day. We can check your situation and recommend you for the most suitable model.
  • Note :
  • 400G RO SYSTEM  :  If you don't mind lower water flow
    600G RO SYSTEM  :  Typical home water flow rate
    800G RO SYSTEM  :  If you prefer the strong water flow
  • Recommended
For Plan A of 75G Reverse osmosis membrane (RO) water purifier, we provide maintenance services every two months and for Plan B, every three months. If you choose this product and also rent a water purifier for the kitchen, only Plan A will be available due to filter exchange.Even when you have black-out or suspension of water supply, 75G Reverse osmosis membrane (RO) water purifier can supply you water from its external tank.
Under Sink Type Water Purifier RO-111(PLAN A) 1200B/month
Phase 1 Phase 2 Phase 3 Phase 4 Phase 5
Hollow fiber membrane filter 5 microns Activated carbon filter Hollow fiber membrane filter 1 micron Reverse osmosis membrane RO filter PRE activated carbon filter
Month 1
Month 2 Replacement Filter replacement frequency
Month 3
Month 4 Replacement
Month 5
Month 6 Replacement Replacement Replacement
Month 7
Month 8 Replacement
Month 9
Month 10 Replacement
Month 11
Month 12 Replacement Replacement Replacement Replacement Replacement
Under Sink Type Water Purifier RO-111(PLAN B) 900B/month
Phase 1 Phase 2 Phase 3 Phase 4 Phase 5
Hollow fiber membrane filter 5 microns Activated carbon filter Hollow fiber membrane filter 1 micron Reverse osmosis membrane RO filter PRE activated carbon filter
Month 1
Month 2
Month 3 Replacement Filter replacement frequency
Month 4
Month 5
Month 6 Replacement Replacement Replacement
Month 7
Month 8
Month 9 Replacement
Month 10
Month 11
Month 12 Replacement Replacement Replacement Replacement Replacement


Monthly charge by water purifier type

Water softener for shower ※1 1,100B ※2 Rental fee for the business use 2,700B
Shower water filter WF-1111 700B Soft water purifier WMF-1111
for washing machine 		800B
Water purifier/softener
for washlet WT-001 		1,000B Five consecutive water filters D-5 600B
Double filter for under basin D-2 300B
  • 1 We will exchange with new products once a year (typically, every two years in other companies).
  • 2 The rental fee will be 700B with once every two years purifier body exchange like other companies.