Cast iron roof terrace and filters, especially in large areas of roof insulation cover is used with the profile,started at the point.
With the body of the filter holder in the gravel, the gravel used in the filtration of the water to go into the blockedprofile, also leaves the grid or holder is preserved for the required distance.

Cleaning taps, Waste water, reaching the line, along the line to prevent the flow of cases, the stations can be used.