The canister is clear it’s just that the indicator on it was not that clear. I like the idea of the refil kit from brs. I will look into getting one of those next. I stopped by Bret’s shop and got a new di filter on order through him. While I was there MrsBrer had some Fluconazole. Since I have been fighting alge I got some of that to treat my tank. And on reflection the top off water I was using was not helping me chase the nitrates in the water. So I will see how well that works.