Keep a service record
Record the installation date and keep your order or lot details. Follow the service interval and operating limits supplied with your AQ cartridge. Contact us if these are missing.
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AQ FILTRATION / PRODUCT GUIDE
AQ 51300CInstallation & care.
A fresh filter.
A few straightforward steps.
For replacing a cartridge in an existing compatible quarter-turn filter head.
QUARTER-TURN CONNECTION REMOVE ↶ / INSTALL ↷
01 / PREPARE
Before you start.
Check the cartridge and equipment
Confirm the cartridge is AQ 51300C and that your equipment accepts this replacement. This guide covers a cartridge swap, not fitting a new filter head or changing plumbing.
Keep your equipment manual nearby for access-panel, power-isolation and filter-monitor instructions.
Have these ready
- A new AQ 51300C cartridge
- A clean cloth and a shallow tray for drips
- A pen to record the installation date
Keep hands and the new connection clean. Do not touch or contaminate the water openings.
02 / REPLACE
Install your filter.
Turn by hand. A quarter turn is all the connection needs.
- WATER OFF
Shut off and make safe
Close the water supply. Dispense water to relieve pressure, then isolate electrical power as directed by your equipment manual. Open the service area safely.
- ¼ TURN ↶
Remove the used cartridge
Place the tray underneath. Rotate the cartridge counterclockwise one quarter turn, then withdraw it from the head. Do not use pliers or force.
- DATE IT
Prepare the new filter
Remove the protective cap. Check that the connection and seal are clean and undamaged. Write the installation date on the label.
- ¼ TURN ↷
Insert and lock
Insert the cartridge into the existing head. Turn clockwise approximately one quarter turn until fully seated, with the label visible. Stop if it will not engage easily.
- CHECK SEALS
Restore and check
Slowly reopen the water supply and check for leaks. Refit the access panel and restore power as your equipment manual directs.
- 10 MIN
Flush before drinking
Dispense and discard water for 10 minutes to clear trapped air and fine carbon particles. Watch for leaks. Follow any additional flushing instructions for your equipment.
- UNIT MANUAL
Check the filter indicator
If a reset is required, use the procedure in your exact equipment manual. Automatic cartridge recognition depends on the equipment; it is not guaranteed for AQ replacements.
Ready for use
Check that the flow is steady, water runs clear and all connections are dry. If anything is wrong, stop and check the troubleshooting notes below.
03 / EVERYDAY USE
A little care goes a long way.
Protect the cartridge
Keep away from heat and freezing. Do not open, refill or attempt to clean the internal media. Follow your equipment manual for cleaning and periods of non-use.
Pay attention to changes
Check regularly for leaks and changes in flow. Persistent unusual taste, odor or discoloration calls for investigation. Clear water alone does not establish water safety.
04 / HELP
Something not quite right?
Water is leaking at the connection
Shut off the water immediately. Isolate power and relieve pressure according to the equipment manual before checking the connection. Inspect the seal and seating. Do not continue using a leaking or damaged assembly.
Flow is low, uneven or contains air
Check that the supply valve is open, the cartridge is fully seated and the first-use flush is complete. If the problem continues, stop and contact support. Do not loosen a pressurized cartridge.
The filter light has not reset
Use the reset procedure for your exact unit. Some units require electronic cartridge recognition. Do not bypass monitoring or assume a green light establishes the cartridge's remaining life. Send us the equipment model if you need help.
When should I replace my AQ filter?
Use the interval and limits specified for your AQ cartridge or lot. The original manufacturer's capacity and service-life ratings are not AQ ratings. Contact support with your lot or order details if you need the correct replacement interval.
REAL PRODUCT SUPPORT
We're here to help.
Include AQ 51300C, your equipment model, order or lot number, and a photo of the connection if relevant.
AQ is an independent replacement-filter brand. Elkay® and WaterSentry® are trademarks of their respective owners; their mention identifies the original replacement reference only. Check compatibility with your specific equipment.
Guide AQ-51300C / Revision 1.0 · November 2026