Is this the general idea?
Get a ketchup bottle with the witch-hat cap; drill a small hole in the bottom; fill it with your solution; invert it where the tip of bottle is in a stream from your spray bar; low pressure sucks out small amounts of your solution continuously. If it is, you could alway get a bottle with and rubber tube that has a nipple on the end (like the needle used to fill basketballs, etc). That could give you more flexabiltiy in mounting location.
Andrew, MASI Treasurer
This message is always under construction: 75-gallon tank; 2, Eheim 2026 filters - one twice broken; Tek Light with 4, 54W T5s (6000K) ; Sand on top of 4:1 sand:clay mixture; Milwaukee CO2 controller; PlantGuild vortex CO2 reactor; pH = 6.6, kH=70mg/l, GH=120mg/l; EI; Flourish excel on 50% weekly water change: AGA Member.