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Replacement instructions for H2O-F45: 

Step 1:

  Turn off incoming water supply to the filtration unit.

Step 2:

  Open the cold water faucet handle to relieve the water 

pressure.

Step 3:

  Remove filter from lid by turning it to the left, then pull 

the filter down out of the lid. Discard the old filter.

Step 4:

  Remove plastic wrapping and cap from new filter.

Step 5:

  To install new filter cartridge, with the filter label facing 

approximately 45 degrees to the left, push the filter into 

the lid and twist it to the right until the filter locks in and 

the label on filter is facing the front.

Step 6:

  Follow start-up procedure. Turn-on water supply at 

cold water angle stop. Turn cold water faucet handle to 

the open position to start the flow of water through the 

unit. Run 5 gallons of water through the unit in order to 

flush out the normal black carbon fines (it will “sputter” 

until the air is purged out) from the unit. A container 

with a known volume can be filled to determine how 

much water has flushed through the system. Initially, 

the water may appear cloudy which is due to tiny air 

bubbles and it will clear up shortly. Close the faucet 

when finished. 

Step 7:

  Check for leaks. If you have any leaks, shut off the 

water supply to your system, tighten any fittings then 

turn the water back on. Check frequently over the next 

24 hours to ensure no leaks are present. If you have 

any questions, please call our retail customer service at 

(888)321-0500

.

Filter Replacement Instructions

Where Used:

Model number / 

Watts Part Number

Model / Watts 

Part Number

Change time frame

H2O-F45 / 88005232

H20-DWCB100 / 

88005231

No more than 12 months or  

10,000 gallons for chlorine from 

installation date

High Capacity Quick Turn Carbon 

Filter: H2O-F45

Replacement filter for Watts Pure H20 High 

Capacity Carbon Block Filtration System, 

H20-DWCB100

Parts Included: 

H2O-F45 Replacement Filter

Operating Specifications: 

Flow Rate: 1.5 GPM (5.7 LPM) 

Temperature Range: 40 – 100°F (4.4 – 37.8°C) 

Pressure Range: 10 – 125 psi (69 – 862 kPa)

WARNING

!

Do not use with water that is microbiologically unsafe or of 

unknown quality without adequate disinfection before or after 

the system. Systems certified for cyst reduction may be used 

on disinfected waters that may contain filterable cysts.

CAUTION

!

Use PureH2O replacement cartridge only. Other filters may look the 

same, but H2O-F45 filters by PureH2O are manufactured to fit your 

H2O-DWCB100 filter unit in order to ensure proper reduction of 

water contaminants.

IMPORTANT

If you are unsure about installing your WATTS water filter, contact a 

WATTS representative or consult a professional plumber.

Component tested and certified by WQA 

against NSF/ANSI Standard 372 for “lead free” 

compliance. Refer the receiving system’s 

Installation and operational manual for specific 

reduction claims and performance data.

Step 5-2

Step 5-1

Step 4

Step 3

Tubing not shown in above pictures. Do not remove the tubings 

while changing the filter

NOTICE

COMPONENT

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