I installed some new "fancy" faucet, and am quite happy with it, except it lacks an aerator, and water easily splashes out of the sink. Obviously, this faucet is calling for an aerator. Unfortunately, the manufacturer doesn't sell aerators for this model, and my local hardware store doesn't carry any that would fit the rectangular end of the faucet (see picture below).
Short of replacing the faucet, how would you deal with this? Can I build myself a custom aerator? If so, how?
I'm a bit concerned that maybe the manufacturer tried, but never got a good aerator working on that shape spout. If you want to try, first take apart a typical aerator and see how it works. There's usually several stainless steel screens stacked on top of eachother. Plus, there's a plastic flow-evener. You can buy stainless steel screen on eBay in big chunks, so that's not a problem. You'd cut them all in the same shape, but some cut on a diagonal. You just need to figure out the grid size for the screen, which you can look-up on wikipedia. You might get a rectangular bit of plastic and drill holes in it to make the flow-evener (creativity required here) and you would need a picture frame shaped object that would be the last bit to go in. That would hold the stainless steel screens you cut and your plastic flow-evener assembly. Probably your biggest problem will be having a way to introduce the assembly into the spout so you can insert it and remove it, but not have it pop off when the water gets turned on. If you don't mind drilling holes in your spout, you could get some small stainless steel screws to hold the assembly in place.
Purchase a heavy-duty stainless steel cooking strainer, cut and remove the mesh and cut a 3" strip, fold in half and insert into the end of the square faucet. This is going to do the job of the aerator.