supply of ring compost ring compost unit for houses , ring compost unit for housesferro - cement ring of diameter 0.7m placed over a circular ferro - cement slab of dia 0.75m and thickness 2.5cm ( without fixing ) . the ring to have a30cmx30cm opening on the side at the bottom with a ferro cement slab cover of the same curved shape which canbe removed and refitted back tightly with locking arrangement for removal of compost when ready . the ring will also have a hole of dia2.5cm at bottom for the leachate to flow out . circular ferro - cement cover slab of .75m diameter and 2.5cm thick with central circular hole of 0.30m diameter to cover the ring . the hole will have a lid cover which can be removed and refitted back for loading the waste into the ring and closing it tightly after loading the waste . option to provide hdpe sheet 0.15 mm in thickness in lieu of ferro- cement slab at the base can aldo be given . in such case the cost can be reduced by rs . 350