TDS reading ppm of the filtered water:

In time, when the DI resin gets exhausted, they will start to get smaller in size and change from light green or brown color to dark brown, almost black color. You must test the tap water going in, the water coming out of the membrane, and the DI water. All references to this information is found in the installation manual and our website. You will need to compare the three ppm numbers to each other. The water coming out of the membrane should be about 90% rejection from the tap. If it is not, it sounds like you need to replace your membrane.

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1 x	MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x	3rd stage C10 carbon block filter (replace every 6-12 months)
2 x	Optional: 564 Membrane Filter Housing Wrench Opener
1 x	.AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
1 x	SET8855 Aquatec 5853 Booster Pump Assembly for Aeroponics System
1 x	913, 5th stage inline carbon filter (every 12 months)
1 x	701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x	HK120 KoolerMax Aeroponics Hydroponics 150G RO Filtration System
2 x	532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x	Discontinued RO155C
1 x	316UP, Upgrade for CTA20 gal/day (includes US Membrane filter)
1 x	335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
1 x	KF310, Elite Series: Polish Chrome Drinking Water Faucet
1 x	2nd stage C10 carbon block filter (replace every 6-12 months)
1 x	KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x	MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x	532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x	KF355, Antique Brushed Brass / Iron Finish Drinking Water Faucet
1 x	.RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x	205, 3rd stage solid carbon block filter (replace every 12month)
1 x	213, 5th stage inline carbon postfilter (replace every 12months)
1 x	RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x	532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
1 x	285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x	324, 4th stage TFC-24 US membrane filter (replace every 2-3 yrs)
1 x	531, PAE RO Storage Pressure Osmosis Water Tank Container 3G

View Cart	$1,587.50

1 x	MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x	3rd stage C10 carbon block filter (replace every 6-12 months)
2 x	Optional: 564 Membrane Filter Housing Wrench Opener
1 x	.AR104H High Efficiency Membrane Aquarium Reef Aeroponics RO DI
1 x	SET8855 Aquatec 5853 Booster Pump Assembly for Aeroponics System
1 x	913, 5th stage inline carbon filter (every 12 months)
1 x	701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x	HK120 KoolerMax Aeroponics Hydroponics 150G RO Filtration System
2 x	532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x	Discontinued RO155C
1 x	316UP, Upgrade for CTA20 gal/day (includes US Membrane filter)
1 x	335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
1 x	KF310, Elite Series: Polish Chrome Drinking Water Faucet
1 x	2nd stage C10 carbon block filter (replace every 6-12 months)
1 x	KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x	MK200, Maintenance kit for Rotek Systems RCT-103 and RTF-265
1 x	532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x	KF355, Antique Brushed Brass / Iron Finish Drinking Water Faucet
1 x	.RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
1 x	205, 3rd stage solid carbon block filter (replace every 12month)
1 x	213, 5th stage inline carbon postfilter (replace every 12months)
1 x	RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
1 x	532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
1 x	285, Big Blue SED2005BB 20" Sediment filter WH25 WH250 WH2201
1 x	324, 4th stage TFC-24 US membrane filter (replace every 2-3 yrs)
1 x	531, PAE RO Storage Pressure Osmosis Water Tank Container 3G

View Cart	$1,587.50