i was just woundering what would be a good way to slow down my filter because its blowing around my sand and its anoying its an aquatech with no flow valve that i can see
What kind of filter... If it is a HOB you can put a prefilter on to slow down the flow, or some people have put a nylon on the output to difuse the water flow. If it is a canister just put a diffuser bar on the output.
I had the same problem this week so i got some tights and stretched a small piece over the outlet and secured with an elastic band. then i put two small holes in it and now the flow is much better.