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puncture a tiny hole in the bottom with a utility knife (test how fast it drips with tap water)
Fill with whatever you want to dose aquarium slowly with
Set bottle on edge above aquarium or sump and let drip slowly until empty.
I use this for maintaining my alkalinity and it works great. I know it might seem stupid and simple but figured I'd share it for people who might want a cheap alternative to dosing pumps.
Happy Reefing