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4.7 Cleaning the PE Tank
1. Put the system into standby by pressing the START button when the tank is
full.
2. Turn the blue valve underneath the tank (see picture below) 90º to close the
valve.
3. Prepare 0.1 M NaOH using analytical grade NaOH (120 g NaOH for the 30-L
tank, and 240 g for the 60-L tank). Dissolve in 1 L pure water, and then pour
into the water tank. Gently mix.
4. Soak the tank overnight.
5. Press down the collet to remove the tubing connected to the "From Tank"
port, put it into the sink.
Note: Please check local regulations on how to properly discharge 0.1 M NaOH.
6. Open the blue valve underneath the tank, drain all solution.
7. Close the valve by turn it 90º. Press the START button to put system into
operation mode to fill half the tank. Put system into Standby.
8. Gently tilt the tank and swirl, then open the blue valve to drain all water.
9. Repeat Step 7 and 8 for two more time.
10. Take a water sample from the tank. Use a pH paper to check its pH. If water
is basic, repeat Step 7 and 8 one more time.
11. Plug the tubing back to the system. Press START to put the system into
Operate mode.
Collet
(push in)
