Having clean, filtered water directly from your tap is a luxury many homeowners take for granted. But over time, the performance of under sink filtration systems declines as filter cartridges become clogged with contaminants removed from your household water. Replacing these filters regularly is essential to maintain the purity and great taste produced by systems like the iSpring US31 3-Stage Under Sink Water Filtration System. This guide will cover when and how to change the filters in your iSpring US31 to keep your family supplied with refreshing filtered water.
Overview of the iSpring US31 3-Stage Filtration System
The iSpring US31 uses a multi-stage filtration process to remove sediments, chlorine, odors, chemicals, heavy metals and other contaminants from tap water while retaining healthy minerals. Feed water enters the system through the 1st stage sediment filter, which traps particulate matter like dirt, rust and sand. The water then flows through the 2nd stage GAC carbon filter to reduce chlorine taste and odor, volatile organic compounds (VOCs), pharmaceuticals and other chemicals. Finally, the 3rd stage CTO carbon block filter polishes the water for premium taste and purity.
The contaminant removal capability of the US31 makes it an ideal choice for households supplied by municipal water sources using chemical disinfectants. The system can deliver up to 1 gallon per minute of purified water to a separate filtered water faucet installed on your sink. It can also connect to refrigerators, coffee makers and other appliances.
When to Change the iSpring US31 Filters
The US31’s sediment, GAC carbon and CTO carbon block filters each have a limited lifespan and must be replaced regularly to maintain performance. iSpring recommends the following filter replacement schedule:
- 1st Stage Sediment Filter – Replace every 6 months
- 2nd Stage GAC Filter – Replace every 12 months
- 3rd Stage CTO Filter – Replace every 12 months
However, filter life can vary considerably based on local water quality and usage rates. Those on private well supplies or municipal water with high particulate levels may need to replace filters more frequently. Homes with above average water use will also require more frequent cartridge changes.
The easiest way to determine when filters need replacement is by monitoring the flow rate from your filtered water tap. As filters become saturated, you’ll notice the water flow getting slower. Once the flow rate drops below an acceptable level, it’s time to swap out the cartridges. Many customers find it convenient to replace all three filters at the same time on an annual basis.
How to Change the Filters in an iSpring US31
Replacing the filters in the iSpring US31 is a straightforward process that can be performed in under 30 minutes with minimal tools. Here are step-by-step instructions:
Supplies Needed
- iSpring US31 Replacement Filter Set (or individual cartridges)
- Phillips screwdriver
- Reusable plastic container (to catch water)
- Paper towels or rags
Step 1: Turn Off Water Supply and Relieve Pressure
Locate the cold water supply line entering the unit and turn the shut-off valve clockwise to the “off” position. Turn on the filtered water faucet to release pressure and drain water from the filtration system.
Step 2: Remove Existing Filter Cartridges
Place a container under the unit to catch any remaining drips. Unscrew the plastic sumps from each filter housing in a counter-clockwise direction. Gently pull down to remove the old cartridges. Discard appropriately.
Step 3: Clean the Housing
Wipe out any dirt or debris inside the empty filter housings using a paper towel or rag. This prevents contamination of the new cartridges. Rinse housings if needed.
Step 4: Install New Cartridges
Unpackage the new sediment, GAC carbon and CTO carbon block filters. wet the o-rings with water and insert each one into its designated housing, pressing firmly until properly seated.
Step 5: Reattach the Filter Sumps
Hand tighten the sumps back onto each filter housing. Do not overtighten.
Step 6: Turn on Water and Check for Leaks
Slowly turn the cold water supply back on and inspect closely for leaks as water begins to flow. Tighten any joints that drip.
Step 7: Flush New Cartridges
Run the filtered water faucet for 5-10 minutes to flush out trapped air and carbon fines from the new filters. Some initial cloudiness is normal and water may have black carbon particles. Flush until it runs completely clear.
And that’s it! With brand new filters in place, your iSpring US31 is ready to keep delivering great tasting purified water for the next 6-12 months. Be sure to write the replacement date on your calendar. Changing filters annually provides the best protection for your health and maintains the quality that makes filtered water so refreshing. Considering the importance of hydration, it’s a small investment to ensure your family has access to clean, contaminant-free water every time they turn on the tap.
Frequently Asked Questions About iSpring US31 Filter Replacement
What is the recommended service life for the US31 filters?
The 1st stage sediment filter should be changed every 6 months. The 2nd stage GAC filter and 3rd stage CTO filter have a 12 month service life. Actual filter life depends on local water quality and usage.
What change in water flow indicates it’s time to replace filters?
If you notice a significant drop in water flow rate from the filtered faucet, it likely means one or more filters are clogged and restricting flow. Time for a change!
Can I reuse the plastic filter housings when replacing cartridges?
Yes, the screw-on sumps that house the US31’s filters are reusable. Just unscrew, remove old filter, insert new cartridge and re-attach. Avoid cross-threading.
Is it necessary to replace all three US31 filters at once?
You can stagger sediment and carbon filter replacements if desired, but most users find it convenient to swap out all cartridges simultaneously on an annual basis.
How long should I flush new filters after a change?
Run water through the new US31 filters for 5-10 minutes to rinse out any loose carbon particles. Flush until the water runs completely clear.
Where can I purchase replacement filters for the US31 system?
Genuine iSpring US31 filters are available on Amazon.com or directly from ispringwaterfilters.com. Use model numbers FP15, FG15 and FC15.
Is professional installation required for US31 filter changes?
Not at all! The filter housings are designed for quick and easy DIY filter replacement. Just follow the basic instructions. No plumbing changes needed.
What is the white sediment I see when flushing new filters?
A little bit of loose carbon and binder material is normal when rinsing new cartridges. Allow water to run until it clears up completely. The sediment is harmless.
Should I sanitize or clean filter housings when replacing cartridges?
Wiping the housings with a paper towel or wet rag to remove dirt is recommended. Optionally, housings can be washed with mild soap and rinsed thoroughly before new filters are inserted.
Changing out the filters on your iSpring US31 systematically every 6-12 months takes just minutes but pays huge dividends in optimized performance and healthy, contaminant-free water for your family. Be sure to use genuine iSpring replacement cartridges for a perfect fit and maximum filtration capability. With some simple periodic maintenance, an under sink system like the US31 will provide a lifetime of refreshingly clean water.