Compupool and Circupool are the same company. Rep. said both work the same, except Circupool has a slightly better warrante and will readout salt level. Rep. was less than helpful.
Compu & Circu both appear to have full plastic cases which will degrade in the sun. Hayward/Goldline have a full meta case.
Compupool does not accept conduit for wiring, the Hayward box does.
A known design flaw with the Hayward unit is that the MOVs eventually fail and need to be replaced. I have made this fix myself, simple and cheap. A fan can be added to the Hayward case for better cooling in extreme hot environments. Parts are also easier to get for the Hayward unit due to it's popularity.
The Autopilot units look nice, but price wise are quite high and full plastic cases? I am not understanding the value.
One issue that does not seem to be brought up in these SWG topics is flow rate. The Compupool cells appear to be more flow restrictive. Hayward's design appears to be about as good as you can get.
Q1 - Is the Compupool case full plastic?
Q2 - Does the Compupool unit have any know failure modes?
Q3 - I have a 2 speed pump. I run low sp. (40 gal/min) for 6 hours. My peak chlorine load is about 92oz of 6% bleach per day. Will a Hayward 1.45# rate cell be able to run that rate on a 6 hour cycle?