scouring pads and plastic scrubbers safe?

[cloudz]

Hi guys I was just wondering if these scouring pads and plastic scrubbers would be aquarium safe. I plan on using them as a mix of mech/bio filtration. I am currently using matrix and polyfil.

 

[Gill Blue]

I wouldn't use the first set., there really isn't any flow through those. as long as there's no detergent added to the second one, lots of people like them.

 

[Yuki Rihwa]

I'm not sure about brand but I'm sure ton of folks using those in their sump.

 

[cloudz]

What brand do you guys typically use? I found the second one at the dollar tree. Would they work well as mech filters too or do people primarily use them for bio?