Thank you for your question. We do apologize, however, the modification of this has the potential to cause damage to the filter motor or cause a leak, which can damage property, this type of modification would void the manufacturer’s warranty.
There is the potential to cause a leak when restricting the outflow, as it will put excess pressure on the gaskets. We have not been informed how much of a pressure increase will cause a leak, so it is best not to modify it in anyway. Restricting the flow into the filter, even to a minor degree, normally will cause the loss of prime/siphon. If this happens, it could result in motor damage.