Water running continuously nonstop drain when tank is full:

The drain should stop when the tank is full and you're not using water.

If the water keeps draining, then there are 2 possibilities:

1. the auto-shut-off valve is not functioning correctly, need to replace the valve. This is the device that has 4 tubing connected to it. It looks like a square block or disc shape

2. the check valve is not working correctly.

Both are wearable parts that need to be changed every 2 to 3 years along with the membrane flow restrictor.

Here's the part you need: RO Maintenance Kit Please make sure to select the corresponding maintenance kit for your RO system model. Any questions please feel free to email us.

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1 x	Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x	532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x	WH-10, Whole House Water Treatment Carbon Filter System 10" Big
1 x	277, SED1005BB Big Blue 5 micron sediment filter 10"
1 x	205 2nd stage solid carbon block filter (replace every 12 month)
1 x	752, DC Booster Pump w/ Transformer
1 x	.AR125NTF KoolerMax AR125 RO System Shell without tank & faucet
1 x	350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x	KT-103, Optional Manual Membrane Flush Valve
1 x	DM-1, Inline Dual TDS monitor (meter) for RO DI System DM1
2 x	Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x	759, Aquatec Demand Delivery Pump 5853-7E12-J524 Commercial 1.7G
1 x	.AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
1 x	FHP2012, 20" long Filter Cartridge Casing Housing RO260 RD322
1 x	Special, Single Stage Housing Bracket Shell Connection Kit
2 x	Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x	202,1 MICRON Sediment filter (replace every 6-12 month) SED1001
1 x	4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x	1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x	DI210, Heavy-duty DI system for Aquarium and Reef
1 x	733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x	PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x	318, 4th stage TFC-18 US membrane filter (replace every 2-3 yrs)
1 x	Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction
1 x	Value Pack- Entire 3 Years of Replacement Filters Bundle AR150P
1 x	KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
1 x	SW SHELL, Countertop SW1 Empty System Only No Filter

View Cart	$1,643.99

1 x	Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x	532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x	WH-10, Whole House Water Treatment Carbon Filter System 10" Big
1 x	277, SED1005BB Big Blue 5 micron sediment filter 10"
1 x	205 2nd stage solid carbon block filter (replace every 12 month)
1 x	752, DC Booster Pump w/ Transformer
1 x	.AR125NTF KoolerMax AR125 RO System Shell without tank & faucet
1 x	350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x	KT-103, Optional Manual Membrane Flush Valve
1 x	DM-1, Inline Dual TDS monitor (meter) for RO DI System DM1
2 x	Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x	759, Aquatec Demand Delivery Pump 5853-7E12-J524 Commercial 1.7G
1 x	.AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
1 x	FHP2012, 20" long Filter Cartridge Casing Housing RO260 RD322
1 x	Special, Single Stage Housing Bracket Shell Connection Kit
2 x	Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x	202,1 MICRON Sediment filter (replace every 6-12 month) SED1001
1 x	4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x	1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x	DI210, Heavy-duty DI system for Aquarium and Reef
1 x	733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
1 x	PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x	318, 4th stage TFC-18 US membrane filter (replace every 2-3 yrs)
1 x	Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction
1 x	Value Pack- Entire 3 Years of Replacement Filters Bundle AR150P
1 x	KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
1 x	SW SHELL, Countertop SW1 Empty System Only No Filter

View Cart	$1,643.99