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Concrete rings for sewerThese come in various sizes. These are 75cm inside dia., 50cm deep, hold 220 litres each and cost 90 baht each. Calculate ?€ x radius?² x depth, to get the volume. We use two silos of four of these rings; the silos are linked for 1st and 2nd stage processing. They will be sealed inside with bitumen paint. That gives us a total of 1,760 litres which is more than enough for a small household. Ready made glass fibre tanks of this capacity cost about 8,000 baht. Another $200+ saved!jazzmanApr 04, 2007
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