Since I've started using Kalkwasser around 2019 I've always used BRS Kalkwasser. Like many other's after all the changes with BRS I figured let me see if I can find an alternative. Ordered some ESV Kalk around 2 months ago(not a fan of ESV their products seems like water but it was around the same price or a little less)to give it ago while my tank is lightly stocked. Always ran Kalk 1-2 ml per minute + 2 part(I just like running both)& man this product just couldn't keep up my Alkalinity even at 3 ml per minute & I knew my tank demand wasn't increasing that much. Cleaned out the Kalk reactor & added the BRS Kalk & BOOM instant spike after 12 hrs at the same 2ml per minute just after 12 hrs..safe to say ESV Kalk goes in the trash..BRS it is..for now..


