Originally Posted by
Floyd R Turbo
I have had a few thoughts about how to remedy your issue with the drain. What I thought up (I can't take full credit for it, the idea was suggested to me by Chrissu a while back) was to make a false bottom in the scrubber. Put the drain in the middle versus the end, then make the box a little wider than the screen (or the screen narrower than the box) and bond a couple of strips of acrylic to the sides of the box, about 1" or so off the bottom (depends on the next step). The make a V-shaped channel out of 2 pieces of acrylic (or a thin piece that is heated and bent in the middle) that is about 2" shorter than the inner length dimension of the box such that it will hang on the strips in the previous step. The idea here is that the effluent from the screen is pushed to the ends of the box, then must travel back to the center to reach the drain. I haven't actually tried this, it's just on paper, but in theory it should work. The key is not to have the bottom point of the V or bend too close to the drain and reduce the outflow and also sturdy enough (thick) so that the drain can't suction it down and stop flow completely.
Since the scrubber grows out long strands, these tend to find their way down the drasin and slow the flow and in your example, can block it. I haven't seen or heard of drain clogging happening that often, and it hasn't happened to me, but today when I looked at the scrubber (day 10) I noticed that the drains were hardly visible from the top, and I have 2 drains that are not directly under the screen (on the ends), so I know what you're concerned with.
To make this work for your system, it would require sealing the hole in the bottom of the box, drilling a new one in the center, bending some 1/8" acrylic (not hard) or bonding some 3/16" or 1/4" (also not hard), and installing a couple of 1/4" x 1/4" strips to the inside of the box (not hard). You would also have to trim off the bottom of the screen and maybe about 1/2" to 1" off the sides. You might not have to do the sides, and wouldn't have to re-cut a slot tube if you just cut then at an angle starting about 1/4 of the way down from the slot.