Resin replacement. Bring your tank back to 0 TDS.
Use this guide to safely remove old resin and refill your Spot Free Rinse tank with fresh DI resin. Watch the video, then work through each step.
⏱ ~15 minutes 🔧 No tools needed 🇦🇺 Aussie support
Read before you start DI resin contains 0.5 mm beads. When dry, these beads are extremely slippery on hard surfaces. Clean spills immediately. Never pour resin down any drains.
Know your parts
What's in your kit and tank
Match the names used in the steps below to the parts shown here.
In your refill kit
- 5 L vacuum-sealed DI resin bags (quantity depends on your order)
- Custom refill funnel with safety cap
- Cloth bag for catching old resin
- Centre extraction tube
- Small extraction hose
Tank components
- Tank head with "IN" and "OUT" connectors
- Top basket and bottom basket
- Riser tube (centre)
- Mesh seal (resin trap) inside the "OUT" fitting
- Rubber seal on the tank head
Before you start
What you'll need
A few household basics. The kit covers the rest.
- Your Spot Free Rinse tank
- External tap with garden hose
- Masking tape (recommended not necessary)
- Scissors
- A space where spills are easy to clean up
Refill guide
Resin replacement instructions
Work through each step to empty, refill, reassemble, and test your tank.
Removing old resin
Flush and empty
- Attach hose to the "IN" connector and fill the tank until water exits the "OUT" connector. The tank needs to be full of water.
- Unscrew the lid slowly — water level should be near the top. Top up if needed. This makes removing the centre tube and filters easier.
- Lift out the lid, top basket, riser tube, and bottom basket together. If the centre tube stays in the tank, remove it separately.
- Insert the white extraction tube fully into the bottom of the tank head and screw the head back on.
Important Unscrew the "OUT" connector, remove the mesh seal (resin trap), then reinstall the fitting. Skipping this will block the flush.
- Connect a hose from your tap to the "IN" fitting in the tank head.
- Connect the small extraction hose into the "OUT" connector and place the other end into the cloth bag. Pull the drawstring tight around the hose.
- Turn the tap to full pressure. Resin will flush into the bag while water drains through.
- When the water runs clear, continue flushing for one more minute.
- Let the cloth bag drain completely. Bag and bin the old resin — never down sinks or drains.
- Tip any remaining water out of the tank.
Tip One cloth bag holds around 10 L of resin. For larger tanks, use a second bag or empty and reuse the first.
Getting ready to add new resin
Prepare to refill
- Open a 5 L resin bag carefully with scissors. Avoid spilling the resin.
- Place the original riser tube with bottom basket back inside the tank.
- Place tape over the top of the tube to block any resin that might get in (recommended).
- Attach the refill funnel and make sure the safety cap blocks the riser tube opening.
Filling with fresh resin
Add new resin
- Pour resin slowly through the funnel in small amounts to avoid clumping.
- Tap or shake the tank and funnel gently to help the resin move through.
- Repeat for additional resin bags as required.
- Lightly compact by lifting the tank 10–15 cm and tapping the base on the ground. Don't use excessive force.
- Resin level should sit just below the bottom of the funnel. The more you can safely pack in, the longer it lasts.
- Bags sometimes contain slightly more resin than the tank holds, so you may have a small amount left over.
Optional Use a slow water flow to compact the resin further, then add a little more carefully. Avoid spills and keep resin off the tank threads.
Reassembling the tank
Put it back together
- Remove the funnel.
- Wipe the tank threads with a cloth so there is no resin left in the threads.
- Remove the white extraction tube from the tank head.
- Guide the riser tube through the top basket and refit the tank head.
- Screw the tank head on firmly, making sure the rubber seal is seated correctly.
Important Unscrew the "OUT" connector again, return the mesh seal (resin trap), then reinstall the fitting. This stops resin escaping into your hose.
Pro move Align the tank jacket so the SFR logo faces out — a little free advertising next time the neighbours walk past.
Testing your water
Verify 0 TDS
- Run water through the tank for around 10 seconds before testing.
- Check the outlet water with your TDS meter.
0 ppm
Fresh resin reading
If above 5 ppm Run water for another 30 seconds and retest. Brand-new resin sometimes needs a quick flush before it settles.
Good to know
Tips & safety
A few extras to make resin last longer and keep things safe.
Helpful tips
Good practice
- Store any unused resin in a sealed bag in a cool, dry place.
- Shake the tank occasionally to maintain even resin distribution.
- Never pour resin down sinks or drains.
Safety notes
Extra safety
- Keep resin away from children and pets.
- Clean spills immediately — dry beads are extremely slippery on floors.
- Dispose of used resin bagged in normal household waste.
