I think he was trying to say the water IN his drop checker is 4dkh, as it should be, the water in the tank is probably a lot harder than the indicator water.
I think he was trying to say the water IN his drop checker is 4dkh, as it should be, the water in the tank is probably a lot harder than the indicator water.4KH isnt Hard water lol. Mine was PH 8.4, GH-15+, KH -23 that is What we call VERY HARD water.