Using kalk water only for topoff?

[Son Of Skyline]

Hi everyone. I just started using kalk yesterday, and I'm wondering how people can get away with only using kalk water for topoff. With my system dripping once every 2-3 seconds, it's not even close to keeping up with my evaporation. I know I should drip any faster for pH reasons, but how do people do it? Am I being conservative with my drip? My pH stands at 8.4 right now (10:00pm). Any info would be appreciated. Thanks!


120gal
27gal sump