Hi Michael, I would ...

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Hi Michael,

I would recommend that if different filtration layers are specified the layers must be classified separately. My perception is also that there is generally a trend away from layering, unless there is a specific requirement for a dual media filter. Depending on the application, I would go for a single layer layer suited for the selected nozzles and then sand must definitely be classified for the specific single media on it's own.

Regards

Andre Visser