Providing and placing in horizontal layers filtering media screened, washed and cleaned as described below:- Second Layer :—– Coarse sand screened, cleaned and washed and graded from 3mm to 6mm (from Pathankot or approved equivalent quarry).
Providing and placing in horizontal layers filtering media screened, washed and cleaned as described below:- Second Layer :—– Coarse sand screened, cleaned and washed and graded from 3mm to 6mm (from Pathankot or approved equivalent quarry).