Quick update, been running my effluent 0.3 l/h for 2 days and tank alk rise from 8.6 dkh to 8.9 dkh. Now lower the effluent to 0.2 l/h. So far satisfied with this product. And I think my media, seachem reef reactor md also works perfectly. Przemek been great help with my kore 7 with kh lab. Even still got reading not right. Maybe because diluted reagent with non 0 tds. Mine was 20 tds.
Regards