RainwaterHarvesters Accessories / Spares

Most inline filters need checking every three to six months, though this varies with roof debris levels and rainfall. A clogged filter restricts flow and can force your system to draw on mains backup unnecessarily, so it's worth inspecting after heavy autumn leaf-fall or storms. Many of our filters have a clear housing or removable cartridge, making the check quick and mess-free.

Most of our filters, valves and gauges use standard thread sizes and fittings, so they'll fit the majority of rainwater harvesting tanks on the market. That said, pump controllers, float switches and display panels are sometimes matched to a specific control system, so it's best to check your existing part's model or connection type before ordering. If you're unsure, contact us with your tank make and installation date and we'll help you find a compatible spare.

A rain sensor monitors tank level and automatically shuts off the inflow or diverts water once the tank reaches capacity, preventing overflow and reducing strain on overflow pipework. It's a sensible addition for unattended systems, particularly on larger domestic or commercial tanks where overflow could cause pooling or damage nearby. Fitting one is straightforward and typically wires into your existing control panel.

A pressure transducer measures water pressure within the system and feeds this data to your pump controller, allowing the pump to run only when needed rather than continuously. This protects the pump from dry-running or short-cycling and can extend its working life considerably. It's particularly useful on systems supplying multiple outlets, such as toilet flushing and outdoor taps, where demand fluctuates.

Yes, a solenoid valve is commonly used to automatically switch supply to mains water when the rainwater tank runs low, ensuring an uninterrupted feed to toilets or washing machines. It's typically installed alongside a float switch or level sensor that triggers the valve. This must be installed with the correct backflow prevention (a type AA or AB air gap) to comply with UK water regulations and avoid contaminating the mains supply.

Most display panels run on low-voltage power from the control unit, so they're simple to install alongside your existing wiring rather than requiring a separate mains connection. They typically show current tank level, total water harvested, and system status, helping you spot problems early and see the real-world savings from your system. Panels are a popular addition for both homeowners wanting visibility and commercial sites needing usage records.