4pcs/Pack 12V DC DIY Peristaltic Liquid Pump Dosing Pump for Aquarium Lab Analytical, Flow Rate 5~100 mL/min

Cost effective dosing pump

I'm using this pump for pool chlorine. So far so good.

These work great if you start using them within a few weeks of getting them, and continue using them. I've found that if you let them sit for too long the rollers will permanently crimp the silicone tubing shut and the only way to get it back open is shoving something through the tube with considerable force, or simply replacing the silicone tube. As far as accuracy, repeatability, and reliability, I find that they all dispense approximately 1mL/second of runtime at 12V, within about 0.2mL. The pumps generally tend to be pretty consistent, so one that pumps 1.2mL/second pretty much always pumps 1.1 to 1.3 mL/second. I should note that I'm using a graduated syringe and an arduino script as my measurement, so take these numbers with a huge grain of salt. If you need precision of less than 1mL definitely qualify the performance each pump and calibrate your dosing circuit accordingly.

these pumps are versatile, and last for many hours. highly recommend.

obviously not the best pump for accuracy, but for slow controlled positive displacement pumping this is worth the cash. if you buy for complete accuracy or low voltage keep in mind it uses a 12v brushed motor and the red marking causes a ccw rotation in the pump if assumed positive otherwise for a cheap positive displacement pump it is great