V2 Portable O ring maintenance 

When maintaining your hot tub, make sure to check your o rings every few months. Looking for any signs of wear and tear or damage by chemical dosage, you will notice this with the fading of the colour.

See red discoloration fading on the first picture.
Incorrect chemical dosage damages the inside of ports on the control unit as shown below, creating more issues in the long term.
Using a tiny amount of fairy liquid and water on the ports of the control unit makes it easy to take the connection pipes on and off. This allows for the o-rings on the ports to remain where they are and not to get damaged when fastened on. (Ports shown below)