hi bro, had a 8-9 tonne pond before, also used fgt as it was the cheapest option. if it is going to be in ground and outdoors do remember the overflow piping to drain off excess rain water.
also do invest in at least 35% to be part of the filter. will save u a lot of effort and i almost never cleaned it, but water was always clear. remember to incorporate those valves that will drain off the dirty filter water into the drain.. do it regularly and u will hardly have to clean your pond.
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