Design Modifications and Improvements

Balancing the T connection at the pressure break

The flow control module (FCM) outflow tubing connects to the T in the selector, which created an unbalance in the T, causing it to tip towards the FCM. This was fixed by balancing the T connectors on the FCM side with two weighted nuts on the other side.

Reducing erroneous variation in lever arm-induced driving head

The chemical dosing tube and its connection to the lever arm were too heavy for the fishing line used. The combined weight was causing the lever arm to sag down and cause many more centimeters of driving head at the farther distances down the arm than closer to the pivot. This makes logical sense based on the principle of moments around a pivot. The whole connection was taken off of the dosing tube and replaced with a simple string that tied around the lever arm instead of clamping to it. The string was taped in place to prevent slipping, and it appeared to greatly reduce the problem of changing driving head from apparatus weight.