What are the installation requirements for a large underground tank?
It is essential you follow the manufacturer’s instructions for fitting or the guarantee will be void. The installation instructions of a typical kit may be downloaded here b) If the ground where the tank is to be installed is well drained and has a low water table, back filling with sharp sand, earth or pebbles is OK. You are advised by the tank manufacturers to provide a concrete base of 150mm under the tank. c) If the ground is habitually wet or the water table is high, there must be a beam or concrete to prevent the tank when empty from popping up out of the ground. Yes, it happens. Alternatively, drain the area directly around the tank with a pump if needed. d) MDPE tanks are not normally strong enough to keep their shape in compression so the tank must be filled with water as you proceed with backfilling.
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