You have any pictures of your autodosing setup.
Walter, here is an oversimplified explaination of my autodosing setup. It's commonly refereed to as a "fountain pump autodoser". Peristaltic pumps are better and people seem to find them cheap now but this works. It's kind of primitive but works.
The first thing you need is a digital timer that has one minute increments. This is very important as these pumps push a lot of water. I didn't take a picture but they are widely available.
Please note that this is not setup yet.
I use this pump. I found a fitting that was the same diameter as a liquid syringe. This allows me to use airline tubing to get the ferts to the tank. Here is how that looks:
You put the pump into a container. I just bought some cheap plastic ones at the dollar store. To "calibrate" it you fill it with water and see how much comes out every minute. Make a mark for each minute. My timer has 26 programs so I just let it run until the water is gone (or almost gone).
I say "calibrate" in quotes because it's not incredibly accurate, and there will always be a bit of water/ferts left over. Each mark represents 1 day of ferts. I got lucky and mine is 14 days so I add 2 weeks of ferts, as per what I would dose daily. So 14 times what you would do per day. And it last 2 weeks. Not the markings on the above picture. This is what it looks like in the container. It normally would be filled with water and ferts.
Hope you are still following. Now, once a day, for one minute, it pumps water/ferts into the tank through the airline hose. I made these little clamps to go on top of my tank. Then I used an airline "T" but melted the plastic so it only comes out one direction. Where the plastic is melted fits into a hole I drilled in the clip. This is what it looks like on top.
Hope that all makes sense.
I will briefly go over the upsides and downsides of this type of system.
-It doesn't take a lot of thought to figure it out. It's just simple physics, no computer controlling or ability to customize, it just is what it is.
-It only takes simple math to figure out how much ferts to mix.
-All components are likely easily available and can be in your house tomorrow.
-It can be expensive for what it is compared to just doing it every day. I do both macros and micros so you need a pump for each, container, timer tubing.
-The amount of days is totally reliant on your pumps and container size. If you get a weird amount of days, it's hard to keep up. My first containers were 23 days. Second try was 10 days. Took me 3 different containers to get it right.
-A bit of ferts/water are left at the end. Every month or so I flush the system out.
Lastly, I really don't think I would have gone to the trouble if I was doing it now. It is good for someone who is out of town or may miss a day here and there. I needed it when I made it. Now I don't need it, but I have it so I may as well use it.
Feel free to PM me if that isn't making sense. I didn't invent the idea, there are some DIY's on the board.