How much
kalk powder did you add to the
RO water? The saturation point is 2 teaspoons/
gal. Could be you just need to increase the drip rate depending on your evaporation. 1-1½
gal of kalkwasser over a five day period could have just maintained the levels depending on what's in the tank.
I tried the link but the site must be down. Connection was refused so I'll look later on what type of doser you are using.
EDIT: what is the
alk level?
Cheers
Steve