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.

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2 x	Optional: 564 Membrane Filter Housing Wrench Opener
1 x	UC SHELL, Honeywell UC7000 Empty System Only No Filter
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	.K6A KoolerMax 75GPD 6STAGE Alkaline pH REVERSE OSMOSIS RO FILTE
1 x	3150, 5th stage TFC-150 US membrane filter (every 2-3 years)
1 x	532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
2 x	201, 1st stage sediment filter (replace every 6-12 months)
1 x	CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x	Discontinued RO585NTF
2 x	Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
2 x	B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x	MK8002, Maintenance kit for double membrane system RD322 RO260
2 x	205, 3rd stage solid carbon block filter (replace every 12month)
1 x	.AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
1 x	365, 4th stage TFC 50/65 US membrane filter (replace 2-3 yrs)
1 x	.K6NTF KoolerMax K6ALK RO shell without tank and faucet
1 x	1.SED2005, 1st stage sediment filter 20" inch for RD322 RO260
2 x	701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x	FV-14, Bobby Float Valve Side Mount RM292-12-N NSF USA
1 x	532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x	602, UV Ultra Violet Sterilization Light Bulb ystem (6 watts)
1 x	HK120-P-220V KoolerMax Aeroponics Hydroponics RO + Booster Pump
1 x	Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x	Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x	752, DC Booster Pump w/ Transformer
1 x	FM60, STEEL BRACKET TRIPLE HOUSING 10" STANDARD FOR RO MOUNT
1 x	Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction

View Cart	$1,704.00

2 x	Optional: 564 Membrane Filter Housing Wrench Opener
1 x	UC SHELL, Honeywell UC7000 Empty System Only No Filter
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	.K6A KoolerMax 75GPD 6STAGE Alkaline pH REVERSE OSMOSIS RO FILTE
1 x	3150, 5th stage TFC-150 US membrane filter (every 2-3 years)
1 x	532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
2 x	201, 1st stage sediment filter (replace every 6-12 months)
1 x	CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x	Discontinued RO585NTF
2 x	Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
2 x	B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x	MK8002, Maintenance kit for double membrane system RD322 RO260
2 x	205, 3rd stage solid carbon block filter (replace every 12month)
1 x	.AR125 Dual Outputs Aquarium & Home Drinking RO Filter System
1 x	365, 4th stage TFC 50/65 US membrane filter (replace 2-3 yrs)
1 x	.K6NTF KoolerMax K6ALK RO shell without tank and faucet
1 x	1.SED2005, 1st stage sediment filter 20" inch for RD322 RO260
2 x	701C, FHC1014 Filter Housing Chamber Casing Clear Color 1/4 FPT
1 x	FV-14, Bobby Float Valve Side Mount RM292-12-N NSF USA
1 x	532wpg, PAE RO water pressure white tank bladder gauge valve 4G
1 x	602, UV Ultra Violet Sterilization Light Bulb ystem (6 watts)
1 x	HK120-P-220V KoolerMax Aeroponics Hydroponics RO + Booster Pump
1 x	Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x	Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x	752, DC Booster Pump w/ Transformer
1 x	FM60, STEEL BRACKET TRIPLE HOUSING 10" STANDARD FOR RO MOUNT
1 x	Y3414CH, Garden Hose Y Adapter Shut-Off Valve Metal Construction

View Cart	$1,704.00