The Global Water GPT pits, which replace conventional stormwater catchment pits, protect the environment from gross pollutants such as plastic bags, cans and other trash plus bark chips, sand and fine silt, by at-source treatment of run-off. They can also be used to protect pumping chambers and down-stream stormwater detention tanks or treatment devices. Multiple units can be installed to ensure effective site coverage and maximise first flush catchment.
Based on the Global Water proven glass reinforced cement (GRC) 600 mm x 600 mm sumps, the GPTs offer optimum versatility, with the outlet able to be installed on-site at any invert to suit site requirements.
Units are available in two configurations, with a bypass unit available for those situations where a clogged silt trap could result in flooding of buildings or adjoining properties.
The gross pollutant / silt traps are fitted with a non-corrosive impact resistant polyethylene basket with significant silt handling capacity, yet light weight enough to enable emptying by hand. Lifting handles are stainless steel.
A galvanized grate suitable for pedestrian or light vehicle traffic is supplied as standard. A heavy duty grate is available as an option.
If the intensity of rainfall exceeds the flow capacity of the silt basket, or if bad housekeeping has allowed the basket to become full or blocked, water will backup onto catchment area. For applications where this is not acceptable, the model GPT-B with a bypass overflow should be used.