Review on S.T. International Aquarium Dosing Pump by Amy Fenner

I use this pump to automatically add chlorine (bleach) to my spa. I'm still doing manual tests, adjusting dosages, and double-checking. For example I started with 40ml every 8 hours and got 4-5ppm. It's a bit high and I was wondering if I tested it right before the 8 hour dose if it would be too low. So I tried 4ml every hour hoping it would keep the level above 1ppm. 3ml/h was almost normal. This pump is easy to use for programming with fixed doses and fixed intervals. There's also a manual dose button that gives you 10ml every 5 seconds, so this is an option if you need to add more. Calibration was easy and the pump delivered fairly repeatable doses. I don't know how much it fluctuates, but for my application it doesn't matter.