What are the effects of adding chemicals to drain lines that lead directly to the scrubber?
I would think that alkalinity supplements could burn the algae, or does it just wash across so quickly that no harm is done?
What about a slow drip of kalk? Does the higher local pH over the scrubber inhibit the algae?
I've always been too chicken to experiment on my own scrubber, but can't help to think that the drain line would be the best place to evenly disperse chemicals before they hit coral.