i started dripping kalkwasser about 2 weeks ago. i only use it as make-up for evaporated water about 1 gallon every 2 days.what a difference this makes.algae is going away corraline algae is appearing everywhere on the rocks it is just beautiful.skimmer is working more efficient.ph rises some , but have to learn to adjust the kalk.ca is 400 dkh is 10. use turbo calcium to supplement when needed.great stuff and cheaper than a reactor. no room for it any how