contact me if you are interested in a silver magnet or trickle tank ..
i don't do the hard sell, so if you want one, great ... if not, whatever ... i'm not going to hound you or anything.
as mentioned by others, the magnet has to be used with well-spent fixer, not wash water.
if there is too LOW a silver concentration you will burn out the magnet.
the trickle tank if for low concentrations of silver ( wash water + fixer that has been through the magnet )
it works very well with the magnet.
i don't think a few dribbles here and there will do much to your leechfield ... but larger amounts might be trouble.
im not sure where you live, but it is usually best to find out locally what you should do when it comes to disposal
because different places have different laws.