Hi there,
I would like to install an IC60. The space is constrained and there are 2 options for the vertical install / u-shape plumbing to prevent backflow to the heater (see picture as green and red option with the IC60 placement indicated in blue).

Green: after the heater and before the pool/spa return valve. However, this is also before the cleaner booster pump.
Red: after the booster pump, pool/spa return valve and heater. Additional benefit - removal of chlorinator.
IC60 instructions recommend before the return valve. I am concerned about corrosion of the booster pump but also the valve. Thoughts?
The install instructions also say “For best flow sensing, provide at least 12"-18" of straight pipe in front of the cell inlet”. Given the u-shape install which distance should I go for - 12 or 18 inches?
PS: The plumbing was messed up by the installer after a recent re-plaster and I will remove some of the angles again when installing the IC60.
I would like to install an IC60. The space is constrained and there are 2 options for the vertical install / u-shape plumbing to prevent backflow to the heater (see picture as green and red option with the IC60 placement indicated in blue).

Green: after the heater and before the pool/spa return valve. However, this is also before the cleaner booster pump.
Red: after the booster pump, pool/spa return valve and heater. Additional benefit - removal of chlorinator.
IC60 instructions recommend before the return valve. I am concerned about corrosion of the booster pump but also the valve. Thoughts?
The install instructions also say “For best flow sensing, provide at least 12"-18" of straight pipe in front of the cell inlet”. Given the u-shape install which distance should I go for - 12 or 18 inches?
PS: The plumbing was messed up by the installer after a recent re-plaster and I will remove some of the angles again when installing the IC60.