[Cthulhu]

I'm looking for 2 dosing pumps for fertilizers.
The problem with those I find on ebay is that they are all 12v or 6v. My father, who does all my electrical setup, told me it would it would be a pain in the ass to have them on another voltage. All of my system is on 120v.

So, looking for 120v dosing pumps, the best I could find are these from Bulk Reef Supply. At 80$ it's quite expensive compared to those from ebay at 20$.
http://www.bulkreefsupply.com/catalog/product/view/id/827/

Do you know of other options I should look at?

 

[DMtankd]

I use the SP100 OEM Fixed Flow Peristaltic Pumps from APT Instruments. I got them outlet plug installed and norpene tubing for durability. I went without the casing an was able to easily mount them to the inside of my stand with wood screws. You can select the RPMs and tubing diameter based on the number of ml/min you're looking for.

They'll come in closer to the $80 range than $20, but they've been rock solid reliable for 3+ years now. As I remember, they were on the less expensive end of the ones I researched and thought would be reliable and practical - that was over 3 years ago though.

 

[Smertrios]

A walwort to get 6v or 12v is pretty cheap and even common enough you might have one from a piece of electronic equipment that has failed. I know I have a few...

Check the aqua-lifter;s they only cost slightly more and run on AC
[Ebay Link Removed] <-- search "aqua-lifter" you can find it that way

 

[scapegoat]

A walwort to get 6v or 12v is pretty cheap and even common enough you might have one from a piece of electronic equipment that has failed. I know I have a few...

seriously this, just get a 6v or 12v plug

 

[Smertrios]

Running on DC the peristalic pumps might be reversible. If they are then with some electronics know how you could reverse the pumps to empty the lines after every dosing so they dont evaporate and get clogged with crystals over time (I'm guessing so this may not be a problem).