About running two, since the Waterbox sump has its sock holders setup differently than other sumps. I don’t think adding a second DI-7 would change anything. Unlike other sumps where water from the intake chamber overflows onto a plate with two holes cut into it, ours goes from the intake, through the first sock hole, then a baffel section and then the second sock holder. I’d imagine that putting a second one would actually reduce the max flow further. Essentially difference of in series vs in parallel. Thoughts?
I ask as I’ve fiddled with my KLIR-4 on my Waterbox 130.4 and only ever got it to work in the second sock chamber and even then it was temperamental, especially when I clean the glass or baste the rock work. I’ve recently gone back to running just a single mesh sock in the second chamber and I’ve noticed that I get absolutely zero detritus build up while running a sock. I’m thinking of changing things up and running the mesh (225 micron) sock in the first and my KLIR-4 in the second. This will ensure I don’t get any detritus build up from by passing the KLIR and take some of the pressure off of the KLIR filter. Makes it more of a polisher. Doesn’t help with the maintenance aspect having to change socks, but I’m already doing that so nothing to lose. Maybe the combo will add a day or two onto my sock changes. With the mesh sock I just pull it and rinse it in the kitchen sink with a sprayer. Takes many a minute. I’ve been using the same sock for a few months. Its starting to turn a little more brown even after rinsing. Might bleach it or throw it in the wash. Might even just toss as they aren’t super expensive if it lasts 2-3 months.
Anyways just some thoughts. Really like my Klir, just haven’t really found the perfect way of making them run in a Waterbox. Been considering getting a new sump to accommodate an algae scrubber and having two parallel socks will be a must