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That was questioned on r2r and reply was floss is optional in center. So the screen wraps around the cup leaving a hole in the middle. The hole concerns me as how much crap it doesn't catch. I do find it easy to just toss floss from my cup and replace. Will see what others say.
Same but bought my at a fabric store and have a bunch left. This has a 250micron mesh screen that fits around the cup not inside. You just rinse and replace it.
I use cups and floss. This originated on r2r and I posted the link there too. Owner came on and few comments and answered questions. Claim is youbrinsevthis screen out no replacement needed and adding floss is opt.
I also have a skimmer for trade or sale. Just needs a good cleaning.
The gorgonians posted earlier are also for sale or trade. I have a piece of green nepthea too.