You obviously have a point, generally I would agree but for me it isn't worth the faff.I care. if I can reduce costs in any way without reducing efficacy im all for it even if I have a bit more work £ 350 /ipc is better in my pocket, bit like melting out of spec fert, my time spent messing around is a much cheaper cost than trying to earn the difference in profit so I can pay the bills if you see what I mean