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	MK8002, Maintenance kit for double membrane system RD322 RO260
1 x	MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x	FM60, STEEL BRACKET TRIPLE HOUSING 10" STANDARD FOR RO MOUNT
1 x	4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x	4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x	SC227, Specialty Filter Refillable Color Changing DI Filter 20"
1 x	UU Clips Pair Membrane to Membrane, 2.5" to 2.5"
1 x	2nd stage C10 carbon block filter (replace every 6-12 months)
2 x	201, 1st stage sediment filter (replace every 6-12 months)
1 x	578, TDS Water Quality Meter tds-3
1 x	718, Tubing 30 feet 1/4" white tube LLDPE PE for drinking water
1 x	671C, Replacement UV Lamp Light for 609C (16 Watt)
1 x	NM-5103, HONEYWELL COUNTERTOP WATER FILTER DISCONTINUED SW1
1 x	bulkic21, Koolermax Inline Carbon Filter
1 x	FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x	IM60, Ice Maker or RV Water Filter, Inline Typle
1 x	Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x	1/2" NPT Digiflow Digital Flow Meter count up total Water Gallon
1 x	Value Pack- Entire 3 Years of Replacement Filters Bundle HK120
1 x	.SW-1C COUNTERTOP WATER FILTER SYSTEM (CLEAR HOUSING)
1 x	4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x	CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x	745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x	288, CB1010BB Big Blue Carbon Block Filter 20K-50K gal 10"
1 x	581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x	Value Pack- Entire 3 Years of Replacement Filters Bundle RO155
1 x	FPK, High Quality Fitting and Connector 3/8" (Value-Pack)

View Cart	$1,159.95

1 x	MK8002, Maintenance kit for double membrane system RD322 RO260
1 x	MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x	FM60, STEEL BRACKET TRIPLE HOUSING 10" STANDARD FOR RO MOUNT
1 x	4044-K qty 2 Male Elbow Fitting Compression type 1/4"
1 x	4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x	SC227, Specialty Filter Refillable Color Changing DI Filter 20"
1 x	UU Clips Pair Membrane to Membrane, 2.5" to 2.5"
1 x	2nd stage C10 carbon block filter (replace every 6-12 months)
2 x	201, 1st stage sediment filter (replace every 6-12 months)
1 x	578, TDS Water Quality Meter tds-3
1 x	718, Tubing 30 feet 1/4" white tube LLDPE PE for drinking water
1 x	671C, Replacement UV Lamp Light for 609C (16 Watt)
1 x	NM-5103, HONEYWELL COUNTERTOP WATER FILTER DISCONTINUED SW1
1 x	bulkic21, Koolermax Inline Carbon Filter
1 x	FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x	IM60, Ice Maker or RV Water Filter, Inline Typle
1 x	Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x	1/2" NPT Digiflow Digital Flow Meter count up total Water Gallon
1 x	Value Pack- Entire 3 Years of Replacement Filters Bundle HK120
1 x	.SW-1C COUNTERTOP WATER FILTER SYSTEM (CLEAR HOUSING)
1 x	4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x	CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x	745, AFAN0409 Female Garden Hose / Laundry Hose Adapter
1 x	288, CB1010BB Big Blue Carbon Block Filter 20K-50K gal 10"
1 x	581, Ice Maker Hookup Kit Connect RO water to Fridge Ice Maker
1 x	Value Pack- Entire 3 Years of Replacement Filters Bundle RO155
1 x	FPK, High Quality Fitting and Connector 3/8" (Value-Pack)

View Cart	$1,159.95