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	SC208, Specialty Filter Iron Lead and Heavy Metal Removal Filter
1 x	205, 3rd stage solid carbon block filter (replace every 12month)
1 x	202,1 MICRON Sediment filter (replace every 6-12 month) SED1001
1 x	FK-BB10K3, Big Blue Filter Pack Bundle for WH-1030 Whole House
1 x	225UP, 5th stage Inline Alkaline upgrade (includes media)
1 x	201, 1st stage sediment filter (replace every 6-12 months)
1 x	SC207, Specialty Filter Refillable Color Changing DI Filter for
1 x	Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x	213, 4th stage inline carbon filter (replace every 12 months)
1 x	B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x	UC SHELL, Honeywell UC7000 Empty System Only No Filter
1 x	MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x	SC412, Water Softening Filter Calcium Magnesium Hardness Removal
1 x	FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x	SW SHELL, Countertop SW1 Empty System Only No Filter
1 x	NM-5001C, HONEYWELL COUNTERTOP WATER FILTER DISCONTINUED SW1
1 x	335, 4th stage TFC 35/45 US membrane filter (every 2-3 years)
1 x	OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x	Conversion Kit, Convert Aquarium to Drinking RO Water System
1 x	SC445, Specialty Filter SPECIAL ALKALINE FILTER Specialty Filter
1 x	673, Replacement UV Lamp Light for 602 (6 Watts)
1 x	SC209, Specialty Filter Nitrate Removal Filter
1 x	SC435, Specialty Filter Arsenic / Fluoride Removal Filter

View Cart	$831.48

1 x	SC208, Specialty Filter Iron Lead and Heavy Metal Removal Filter
1 x	205, 3rd stage solid carbon block filter (replace every 12month)
1 x	202,1 MICRON Sediment filter (replace every 6-12 month) SED1001
1 x	FK-BB10K3, Big Blue Filter Pack Bundle for WH-1030 Whole House
1 x	225UP, 5th stage Inline Alkaline upgrade (includes media)
1 x	201, 1st stage sediment filter (replace every 6-12 months)
1 x	SC207, Specialty Filter Refillable Color Changing DI Filter for
1 x	Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x	213, 4th stage inline carbon filter (replace every 12 months)
1 x	B2010, 20" Big Blue Filter Housing Cartridge WH20 WH25 WH250
1 x	UC SHELL, Honeywell UC7000 Empty System Only No Filter
1 x	MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x	SC412, Water Softening Filter Calcium Magnesium Hardness Removal
1 x	FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x	SW SHELL, Countertop SW1 Empty System Only No Filter
1 x	NM-5001C, HONEYWELL COUNTERTOP WATER FILTER DISCONTINUED SW1
1 x	335, 4th stage TFC 35/45 US membrane filter (every 2-3 years)
1 x	OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x	Conversion Kit, Convert Aquarium to Drinking RO Water System
1 x	SC445, Specialty Filter SPECIAL ALKALINE FILTER Specialty Filter
1 x	673, Replacement UV Lamp Light for 602 (6 Watts)
1 x	SC209, Specialty Filter Nitrate Removal Filter
1 x	SC435, Specialty Filter Arsenic / Fluoride Removal Filter

View Cart	$831.48