Why install booster pump before 4th stage membrane:

Install the booster pump before stage1 is easier but the solenoid valve and pump may get dirty water and debris from water supply hence shorten the life of the solenoid valve and pump. Also the bottom 3 filters will not see high pressure to prevent bursting of filter housing. The pressure switch can be installed anywhere after the RO membrane on the pure water side. Either way works.

Continue

1 x	701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x	.SW-1 COUNTERTOP WATER FILTER SYSTEM (WHITE HOUSING)
4 x	Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x	ERP500 Aquatec Permeate Pump Reverse Osmosis RO System USA made
1 x	SV-24DC-38-Brass KSD Solenoid Valve 3/8" brass 24V DC ESO
1 x	399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x	FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x	2.CB2010, 2nd stage carbon block filter 20" inch for RD322 RO260
1 x	3rd stage C10 carbon block filter (replace every 6-12 months)
1 x	718TB38, Tubing, 20 feet 3/8" white LLDPE PE for drinking water
1 x	1st stage SF05 sediment filter (replace every 6-12 months)
1 x	326, 3rd stage TFC 24 /26 US membrane filter (replace 2-3 yrs)
1 x	MKP, Maintenance kit for K5150P K6150P AR150P
1 x	FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x	MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x	.K6A KoolerMax 75GPD 6STAGE Alkaline pH REVERSE OSMOSIS RO FILTE
1 x	Discontinued RO585NTF
1 x	719, Drain Saddle Clamp / Valve
1 x	B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
2 x	ACT-820-JG Aquatec Pulsation Dampener Accumulator Pressure Tank
1 x	KT-103, Optional Manual Membrane Flush Valve
1 x	565, Digital Pressure Gauge Tester Monitor
1 x	Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x	201, 1st stage sediment filter (replace every 6-12 months)
1 x	FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
1 x	FK-53, Replacement Filter Pack SED2005 CB2010 for RD322 RO260
1 x	.AR122 KoolerMax 6STAGE Aquarium Reef REVERSE OSMOSIS RODI WATER
1 x	Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction
1 x	B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134

View Cart	$1,238.89

1 x	701, FH1014 Filter Housing Chamber Casing White Color 1/4 FPT
1 x	.SW-1 COUNTERTOP WATER FILTER SYSTEM (WHITE HOUSING)
4 x	Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x	ERP500 Aquatec Permeate Pump Reverse Osmosis RO System USA made
1 x	SV-24DC-38-Brass KSD Solenoid Valve 3/8" brass 24V DC ESO
1 x	399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x	FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x	2.CB2010, 2nd stage carbon block filter 20" inch for RD322 RO260
1 x	3rd stage C10 carbon block filter (replace every 6-12 months)
1 x	718TB38, Tubing, 20 feet 3/8" white LLDPE PE for drinking water
1 x	1st stage SF05 sediment filter (replace every 6-12 months)
1 x	326, 3rd stage TFC 24 /26 US membrane filter (replace 2-3 yrs)
1 x	MKP, Maintenance kit for K5150P K6150P AR150P
1 x	FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x	MK550, Maintenance kit for RO585, RD102, RD106, RO6, K5, K6
1 x	.K6A KoolerMax 75GPD 6STAGE Alkaline pH REVERSE OSMOSIS RO FILTE
1 x	Discontinued RO585NTF
1 x	719, Drain Saddle Clamp / Valve
1 x	B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
2 x	ACT-820-JG Aquatec Pulsation Dampener Accumulator Pressure Tank
1 x	KT-103, Optional Manual Membrane Flush Valve
1 x	565, Digital Pressure Gauge Tester Monitor
1 x	Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x	201, 1st stage sediment filter (replace every 6-12 months)
1 x	FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
1 x	FK-53, Replacement Filter Pack SED2005 CB2010 for RD322 RO260
1 x	.AR122 KoolerMax 6STAGE Aquarium Reef REVERSE OSMOSIS RODI WATER
1 x	Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction
1 x	B1034, 10" Big Blue Filter Housing Cartridge WH5 WH10 WH1134

View Cart	$1,238.89