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5 Retention tanks to be filled - Drainage metal / Cirtex rain system

We have 5 retention tanks, that have been dug. Roughly 6mX1.5x1.5. We have the cirtex system to be installed on 4, the product is on site ready to be put together and installed. We have 50% filled the final hole with drainage metal. Needs to have pipe run and connected to it, remaining 50% of metal is on site ready to be added to the hole. Work through Christmas period preferred