Are there any extremely robust, leak-resistant on-faucet water purifiers?

Try filtering at an earlier spot like under the sink filters. They are more pricy but work well

@gooch: I don’t have exposed pipes under the sink. Wall => faucet. :(

All plumbing issues, sooner or later, have you rushing to the hardware store or groveling to the plumber. (Unless you marry one.) You have my deepest sympathies.

try the waterpik filter system. I got mine at lowes. The filters are much less expensive and under the faucet you can unscrew the screen and put your dishwasher attachment. I only mention lowes cause thats the only place I have seen them.

Andrew; my taps have fixtures w. small screens (under washers) in them. Once a month or so, I take them apart and brush the rust particles out or poke w. toothpick.

the filter i was referring to is the same as the brita or pur filters that go over the faucet. it’s less expensive than both of those and I have found it to be of pretty good quality.

you can see what I mean here: link

I have not tested it with a portable dishwasher, but I imagine that if you use sealant tape to eliminate leaks, it will work.