Agree. Pls use RODI water with 0 TDS. Sometimes I will go until 2 to 3 TDS knowing that I am replacing for my filters soon. As we move along in reefing, we are eliminating the question on water quality with RODI and able to focus on other issues, if there is any problem. Happy reefing. Sent from my RNE-L22 using Tapatalk