If the feeder works by simply shaking powder in the hopper through holes, how do you know you are dispensing the same right amount every day?
Some very nice ideas here.
That is not how it works. You pre-fill the compartments, and that amount is then emptied into your tank.
Only issues with that are incomplete dosing with some powder still stuck in the compartment, moisture that might cake your hygroscopic salts, and any of the powder getting into the mechanism and hosing that one.
wasserpest posted a nice pros and cons list for each method of autodosing. peristaltic doesnt have a single downside except for the $$$. There are quite a few cons against the syringe method (though I think its ingenious)
The basic idea I am trying to put out is that it ISNT expensive. Ya just need to shop right. Buying a brand new specialty pump from a specialty store is going to cost an arm an a leg over a used industrial pump (which is designed for heavy use) off an appliance repair store. The pumps design means as long as you replace the tubing, there is 0% cross contamination.
** and it cost less b/c I didnt attempt to redesign the wheel and purchase liquidosers and feeding machines to try and make something new and untested.
there are no reasons to replace tried tested and true methods unless there is a downside to them. As the downside to my design is believed to be cost, I'm trying to show thats not inherently true.
The peristaltic pumps aren't that
expensive, only if compared to the other cheapo methods. Some of the peristaltic pumps are not 100% reliable.
Another drawback is that the solutions can settle over time, but that can be fixed by shaking them up once in a while, or even adding a tiny pump or stirrer to the solution containers.
And that's a good idea about using peristaltic pumps used in large scale for other purposes. Need to check that out.