Catchment Water Pre-Filter

[Bob Orts]

I looked through all the past post and didn't really see anything on pre-filtering of catchment water. The systems I'm use to seeing are individual or combo of sand bed or bio-pads. The idea is to keep as much hard and biological debris out of the storage tank to reduce contaminants and organic growth.

So, in addition to the "debris" type filters/diverters/flushers are there any pros or cons to using prefilters from the gutters to the catchment tank? Are there technical reasons it just won't work on a catchment type system?