Product Info
The Split Master is a packaged alternative water source system allowing for the collection, storage and re-use of rainwater for indoor and outdoor requirements. Versatile and out of sight, the systems come in 3000L, 4550L and 5000L cells (tanks) with the ability to be combined to create reservoirs to suit any project size for domestic or commercial use. The automatic mains water top-up valve allows you to continue using the system during periods of little or no rainfall.
The Split Master is easy to install, child-safe and compliant with all statutory regulations. This complete packaged system saves valuable time and money.

Function
The Action Tanks Complas Underground Split Master System a ‘lightweight’ space saving underground tank that provides lifting lugs at top of the tank for ease of maneuverability and installation; it’s also extremely durable and highly resistant to cracking caused by external pressure created by ground movement.
The Split Master provides an alternative water source for:
- Toilet (x2)
- Laundry cold water tap (x1)
- External tap for garden watering requirements and car washing (x1)
The Split Master Control box is separate to the underground tank and normally located next to your house or garage, allowing the tank to be installed in a variety of different locations including under the patio, driveway or lawn.
Installation
Typical Single Tank Install

Downloads
Features & Benefits
The Action Tanks Complas Underground Rainwater system is lightweight' space saving' underground tank that provides lifting lugs at top of the tank for ease of maneuverability and installation; it's also extremely durable and highly resistant to cracking caused by external pressure created by ground movement.
Additional features and benefits include:
- Underground Cell Approved and Certified to AS/NZS 1546.1
- First to receive 'Smart Approved Watermark'.
- Watermark control box.
- Lightweight, robust bell-shaped cell combats hydrostatic lift.
- Cost-effective and easy to install design.
- Child-safe 150mm access point at top of tank for maintenance.
- High quality Onga Dominator Submersible pump and controller
- Underground cells are easily combined to create large reservoirs.
- Made from finest quality food-grade polyethylene.
- Meets Aust. Standards AS4020- drinking water use.
- Meets Aust. Standards AS2070 for food contact use.
- Council regulation compliant for easy approval.
Underground Tank Out of Sight Located under your lawn, patio or driveway, the tank is hidden, with only the Child Safe 15cm inspection cap visible.
Standard Inclusions

- Choice of 3000L, 4550L or 5000L Action Tanks Complas underground poly cells (tanks). Additional servant tanks combined create large reservoirs.
- Onga Dominator Submersible Pump and Water Switch DW7556.
- Automatic mains water diversion which allows the system to switch to mains water when tank water is low or a if there is a power outage.
- First Flush Diverter and Mosquito-Proof 1mm Stainless-Steel Leaf Screen. This is separate to the tank, which is located between house and tank (e.g. garden bed).
- Testable double check valve for backflow prevention (QLD & VIC requirement only).
- Electrical: 10amp single phase - only hard wiring required.
- 100mm Non-return storm water valve
Related Products
First Flush Diverter 22L
Underground First Flush Diverters improve water quality and reduce tank maintenance.


