For those of you tuning in expecting a biology lesson, sorry to disappoint you! Lol.
What are these, see picture below?
Some time ago I recognised that they could be used in my sump as a bit of extra surface area for BB. They come individually and take some time to collect, about 12 months worth here!
They are sealed black Polypropylene hollow balls. My plan is to collect a few more, give them a real good roughing up with very coarse sandpaper and just drop them in my sump. I may drill a hole in the odd one so they just sit under the surface rather than directly on top of the surface as they would now.
They are that obscure I will be extremely surprised if any one guesses correctly. I'm pretty sure what i'm doing with these is a first!!
So come on, guess away.

What are these, see picture below?
Some time ago I recognised that they could be used in my sump as a bit of extra surface area for BB. They come individually and take some time to collect, about 12 months worth here!
They are sealed black Polypropylene hollow balls. My plan is to collect a few more, give them a real good roughing up with very coarse sandpaper and just drop them in my sump. I may drill a hole in the odd one so they just sit under the surface rather than directly on top of the surface as they would now.
They are that obscure I will be extremely surprised if any one guesses correctly. I'm pretty sure what i'm doing with these is a first!!
So come on, guess away.

