Please Use the following guidelines when adjusting the flow control valve of the Aquaripure denitrator:

Small-  The small Aquaripure is recommended for tanks between 20 and 45 gallons.  The recommended flow rate is 1 drop per second.  You should easily be able to time it against the second hand of a clock.

Medium- The medium Aquaripure is recommended for tanks between 45 and 90 gallons.  The recommended flow rate is 3 drops per second.  You should easily be able to time it against the second hand of a clock.

Large- The large Aquaripure is recommended for tanks between 90 and 180 gallons.  The recommended flow rate is 6 drops per second.  At 6 drops per second the flow rate becomes a  fast drip.  To measure 6 drops per second you can take a 5 ml vial and it will fill up in about 8-9 seconds.  Once you measure it once or twice you will be able to quickly judge it by sight.

X-Large- The X-Large Aquaripure is recommended for tanks between 180 and 400 gallons.  The recommended flow rate is 9 drops per second.  At 9 drops per second the flow rate is just beginning to change from a fast drip to a slow stream.  You will be able to fill a 5 ml vial in 5 to 6 seconds.  Once you measure it once or twice you will be able to quickly judge it by sight.

5 ml vials are commonly found in most nitrate test kits.  If you do not have one then the 5 ml mark on the syringe provided with the Aquaripure can be used.  Again, once you measure it once or twice you will be able to quickly judge it by sight. 

To adjust the flow rate, open the valve just until a strong stream is present and then decrease the flow to the correct rate.  The flow rate can and will vary slightly and this is perfectly normal.  Let the water completely fill the outflow tube so that it is full before adjusting the drip rate downwards.  This will let you accurately gauge the flow.  Some fluctuation in the flow rate in between adjustments is normal and even preferable as it indicates the Aquaripure is working correctly. You do not have to continuously adjust the flow valve.  You should only adjust the flow control valve every two to three days, daily adjustment is not necessary.