I'm speaking about this product:
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+3579+3584+21426&pcatid=21426
They work great on my power filters, but the way most powerhead intakes are tapered, I'm unsure how secure a fit it is. If you're using them with powerheads, let me know which brand/model you're using and how well the prefilter fits on it.
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+3579+3584+21426&pcatid=21426
They work great on my power filters, but the way most powerhead intakes are tapered, I'm unsure how secure a fit it is. If you're using them with powerheads, let me know which brand/model you're using and how well the prefilter fits on it.