Final-stage filtration matched to how you use your rainwater.
Post-Tank Filtration
Once water leaves your tank, post-tank filtration gives it one last polish before use. Our Rain Harvesting™ Post-Tank Filtration range covers everything from single-stage sediment filtration for garden and irrigation lines through to three-stage systems with self-cleaning and longer cartridge life. Pick the level that matches your system. For rainwater use only, not intended for drinking water.
Post-Tank Filtration
From single-stage to three-stage sediment filtration.
Post-tank filtration is the last filtration step before your rainwater is used. Our single-stage Triple Action and Sediment Filtration Systems keep dirt, silt and grit out of irrigation lines and garden taps. Two- and three-stage systems add further filtration cartridges, and the three-stage self-cleaning system uses a counter-current cleaning cycle that extends cartridge life and delivers consistent flow at high volumes. Whichever level you choose, replacement cartridges are easy to source and easy to change. For rainwater use only, not intended for drinking water.
Match the filter to the use.
Step 9 of The 12 Steps of Rain Harvesting™.
Why it matters
Keep sediment out of garden and irrigation lines
Single-stage filtration
Single-stage filters take dirt, silt and grit out of your rainwater before it reaches garden taps and irrigation lines, helping protect downstream fittings from sediment.
Add an extra stage of filtration
Two-stage filtration
Two-stage systems add a second cartridge for an extra stage of filtration, with each cartridge handling part of the job so the system keeps working for longer between changes.
Longer cartridge life, consistent flow
Three-stage, self-cleaning
Three-stage self-cleaning systems use a counter-current cleaning cycle on the first cartridge to extend its life and hold a consistent flow at higher volumes, so the system keeps performing between cartridge changes.
Why it matters
Single-stage filtration
Single-stage filters take dirt, silt and grit out of your rainwater before it reaches garden taps and irrigation lines, helping protect downstream fittings from sediment.
Frequently asked questions
Why install post-tank filtration when I already have pre-tank filtration?
How do I choose between a single, two, or three-stage filtration system?
What's the difference between sediment, carbon, and multi-action cartridges?
How often do I need to replace the cartridges?
Can I install a post-tank filtration system myself?
Will adding a post-tank filter reduce my water pressure?
Need help choosing?
Matching the filter to how you use your rainwater.
Different uses call for different levels of filtration. Tell us about your system and we will help you pick the right one.
The Handbook
The ultimate guide for help and inspiration to start your rainwater harvesting journey today.