Continuous Sand Filter (CSF)

We offer a Continuous Upflow Filter, which can filter influent containing up to ten times more dirt than a conventional filter. This revolutionary sand filter does not require to be backwashed to keep the filter bed clean as the sand bed is continuously cleaned and regenerated by internal recycling. This ensure uninterrupted operation without stopping for backwash. The continuous operation results in a constant and low pressure drop. Maximum clean filtrate is assured since the filter bed always contains a certain amount of solids which improves filtration. This mode of operation also enables the filter to accept a highly polluted flow with high efficiency. The unique cleaning method means backwash water storage tanks and backwash pumps can be dispensed with.

Principle of operation

The sand bed of this continuous upflow filter is dirtiest around the feed inlet in the lower part of the filter. The dirty sand is carried from the lower part of the filter through the air lift pump up to the sandwasher in the upper part of the filter. The cleaned sand is then returned to the upper layer of the bed. The entire filter bed is thus constantly moving downwards. This continuous action enables it to filter influent containing uo to ten times more dirt than a conventional filter.

Now the Government of India and many international Agencies have fixed a maximum allowable limit of 0.01 PPM of Arsenic Content and 0.30 PPM of Iron content.