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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1 x	6044-combo Compression Type Fitting Elbow and Tee fitting
1 x	709, Automatic Shut Off Valve 4-way Four Way Valve
1 x	Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x	Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
2 x	Optional: 564 Membrane Filter Housing Wrench Opener
1 x	385, 4th stage TFC 75/85 US membrane filter (every 2-3 yrs)
1 x	FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x	KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x	SV-110AC-14, Solenoid Valve 1/4" plastic 110VAC ESO
1 x	350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x	UC SHELL, Honeywell UC7000 Empty System Only No Filter
1 x	335, 3rd stage TFC 35/45 US membrane filter (every 2-3 yrs)
2 x	KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x	.K6NTF KoolerMax K6ALK RO shell without tank and faucet
2 x	532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x	Parts, Ro Water System Installation Parts Bag 1/4"
1 x	213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x	PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
1 x	DM-1, Inline Dual TDS monitor (meter) for RO DI System DM1
1 x	SC208, Specialty Filter Iron Lead and Heavy Metal Removal Filter
1 x	Value Pack- Entire 3 Years of Replacement Filters Bundle K5
1 x	OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x	FM-8000T, DigiFlow Digital Water Flow Meter Rate Count Down
1 x	Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x	Special, Single Stage Housing Bracket Shell Connection Kit
1 x	Discontinued RD106
1 x	202,1 MICRON Sediment filter (replace every 6-12 month) SED1001
1 x	204, 2nd stage GAC filter (replace every 6-12 months)

View Cart	$1,201.93

1 x	6044-combo Compression Type Fitting Elbow and Tee fitting
1 x	709, Automatic Shut Off Valve 4-way Four Way Valve
1 x	Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x	Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
2 x	Optional: 564 Membrane Filter Housing Wrench Opener
1 x	385, 4th stage TFC 75/85 US membrane filter (every 2-3 yrs)
1 x	FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x	KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x	SV-110AC-14, Solenoid Valve 1/4" plastic 110VAC ESO
1 x	350UP, Upgrade Kit TFC50 gal/day (includes US membrane filter)
1 x	UC SHELL, Honeywell UC7000 Empty System Only No Filter
1 x	335, 3rd stage TFC 35/45 US membrane filter (every 2-3 yrs)
2 x	KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x	.K6NTF KoolerMax K6ALK RO shell without tank and faucet
2 x	532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x	Parts, Ro Water System Installation Parts Bag 1/4"
1 x	213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x	PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
1 x	DM-1, Inline Dual TDS monitor (meter) for RO DI System DM1
1 x	SC208, Specialty Filter Iron Lead and Heavy Metal Removal Filter
1 x	Value Pack- Entire 3 Years of Replacement Filters Bundle K5
1 x	OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x	FM-8000T, DigiFlow Digital Water Flow Meter Rate Count Down
1 x	Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x	Special, Single Stage Housing Bracket Shell Connection Kit
1 x	Discontinued RD106
1 x	202,1 MICRON Sediment filter (replace every 6-12 month) SED1001
1 x	204, 2nd stage GAC filter (replace every 6-12 months)

View Cart	$1,201.93