Everything that secures, protects and quietly looks after your stored rainwater.
On Tank
The tank is where all the work you have done so far gets stored. Our Rain Harvesting™ On Tank range covers the inlets, overflows, vents and outlets that secure your tank from insects, vermin, sunlight and stormwater, plus the in-tank components that help your stored water stay calm and easy to draw from. Quiet, hard-working hardware that does its job for years without asking much in return.
On Tank
Every entry, exit and opening, properly secured.
Securing the tank means protecting every entry, exit and opening. At the inlet, a tank screen keeps insects, vermin and debris out while a solar shield blocks the sunlight that drives algae growth. At the overflow, correctly sized outlets and flap valves let water leave cleanly, and an Air Gap stops stormwater flowing back into a tank connected to the mains. Vents let the tank breathe and outlets let you draw water when you need it, so every opening is accounted for and your stored water stays clean.
A secure tank is a clean tank.
Step 6 of The 12 Steps of Rain Harvesting™.
Why it matters
Keep mosquitoes, leaves and sunlight out
Tank screens and solar shields
Tank screens use 955 micron (0.955mm) stainless steel mesh to keep insects, vermin and debris out at the inlet. Solar shields block direct sunlight, which slows algae growth and creates a calm entry point so incoming water does not disturb settled sediment. Together they protect water quality at the most vulnerable point of your tank.
Manage your overflow safely
Tank overflows, flap valves and Air Gaps
Your overflow needs to handle the same flow rate as your inlet during heavy rainfall. Properly sized tank overflows and flap valves let water exit cleanly, while an Air Gap stops stormwater from ever flowing back in during a storm event. Essential for any tank connected to stormwater mains.
Filter as water enters the tank
Maelstrom® filters and tank fittings
Maelstrom® filters deliver superfine pre-tank filtration down to 180 microns, with 96% water catchment even at 10 litres per second. Combined with vent cowls, tank outlets and overflow screens, they keep your stored rainwater consistently clean for years of use.
Why it matters
Tank screens and solar shields
Tank screens use 955 micron (0.955mm) stainless steel mesh to keep insects, vermin and debris out at the inlet. Solar shields block direct sunlight, which slows algae growth and creates a calm entry point so incoming water does not disturb settled sediment. Together they protect water quality at the most vulnerable point of your tank.
Residential System
See how each on-tank component fits into a complete rainwater system. Tap any hotspot to learn what it does and why it matters.
First Flush Calculator
Easily calculate how much water you need to divert and discover which First Flush Diverter is right for you.
Mass Balance Tool
Calculate your monthly and annual tank levels based on your usage, collection area and rainfall patterns.
Rain Head Selector
Select the right rain head for your property.
Product Selection Tools
Practical tools that help you spec your system right the first time, from sizing your First Flush Diverter to picking the right Rain Head.
Frequently asked questions
Why does what you install on your tank matter so much for water quality?
Why is overflow management important for a rainwater tank?
How does the rainwater in my tank stay in good condition between rain events?
Setting up your tank?
Get the right fittings for your tank.
Inlets, overflows, screens and covers, the right combination depends on your tank and your setup. Tell us what you have and our specialists will help you choose. 35+ years of helping people collect quality rainwater.
The Handbook
The ultimate guide for help and inspiration to start your rainwater harvesting journey today.