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	PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x	Annual Filter Kit Koolermax Series KPAK-3 Sediment Carbon Block
1 x	.K5NTF KoolerMax K5 RO System Shell without tank and faucet
1 x	.K5150P, KoolerMax 150GPD 5 Stage RO System w/Booster Pump
1 x	Discontinued RD102
1 x	531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x	Optional: 564 Membrane Filter Housing Wrench Opener
1 x	3rd stage C10 carbon block filter (replace every 6-12 months)
2 x	Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x	205, 3rd stage solid carbon block filter (replace every 12month)
1 x	565, Digital Pressure Gauge Tester Monitor
1 x	.AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x	KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x	532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x	673, Replacement UV Lamp Light for 602 (6 Watts)
1 x	SET88 Aquatec 8852 AC Booster pump Solenoid ESO Pressure Switch
1 x	818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x	Discontinued RO585
1 x	.RD322 Aquarium 260-300 GPD REVERSE OSMOSIS RO+DI WATER SYSTEM
1 x	399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x	Special, Single Stage Housing Bracket Shell Connection Kit
1 x	.K5 KoolerMax 75GPD 5 STAGE REVERSE OSMOSIS RO FILTER SYSTEM
1 x	RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x	.K6150P, KoolerMax 150GPD 6 Stage RO System w/ Booster Pump
1 x	578, TDS Water Quality Meter tds-3
1 x	BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250

View Cart	$2,472.99

1 x	PSW-340 Aquatec Pressure Switch 40 psi shut off 3/8" tubing TSO
1 x	Annual Filter Kit Koolermax Series KPAK-3 Sediment Carbon Block
1 x	.K5NTF KoolerMax K5 RO System Shell without tank and faucet
1 x	.K5150P, KoolerMax 150GPD 5 Stage RO System w/Booster Pump
1 x	Discontinued RD102
1 x	531, PAE RO Storage Pressure Osmosis Water Tank Container 3G
1 x	Optional: 564 Membrane Filter Housing Wrench Opener
1 x	3rd stage C10 carbon block filter (replace every 6-12 months)
2 x	Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x	205, 3rd stage solid carbon block filter (replace every 12month)
1 x	565, Digital Pressure Gauge Tester Monitor
1 x	.AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
1 x	KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x	532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x	673, Replacement UV Lamp Light for 602 (6 Watts)
1 x	SET88 Aquatec 8852 AC Booster pump Solenoid ESO Pressure Switch
1 x	818, DI Resin Refill Bag 16oz (good for up to three refills)
1 x	Discontinued RO585
1 x	.RD322 Aquarium 260-300 GPD REVERSE OSMOSIS RO+DI WATER SYSTEM
1 x	399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x	Special, Single Stage Housing Bracket Shell Connection Kit
1 x	.K5 KoolerMax 75GPD 5 STAGE REVERSE OSMOSIS RO FILTER SYSTEM
1 x	RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x	.K6150P, KoolerMax 150GPD 6 Stage RO System w/ Booster Pump
1 x	578, TDS Water Quality Meter tds-3
1 x	BBK20, Replacement Filter 20" Big Blue Whole House WH-2201 WH250

View Cart	$2,472.99