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The eco sac™ is a revolutionary, new flexible rainwater storage system that hides away under decks or floors making it much more discrete than traditional tanks. The bladders are made from a beige coloured puncture-resistant PVC material which enables potable water storage to Australian Standards. That means that the water captured can be used to safely fill swimming pools and fish ponds without fear of contamination from the bladder. The bladders sit in a strong galvanised steel frame supported by industrial strength geo tech fabric which gives added protection.