Does the dosing sizes I need but can't alternate days.

Works great, had a malfunctioning one prior. Fish-street solved the problem! Now my plants can get their nutrients without me worrying about it everyday.

Easy to use and appears to be good quality. I needed a small dosing unit for a frag tank, this works perfectly. I would give it an 'excellent', but I've only had it running 2 months. I'll comment again later to see how it holds up after a year! So far so good...