So this may be a silly thing to consider. I currently have separate systems for my inground pool and spa. I am thinking about combining the systems (so I can use my SWCG and acid feed for both) and installing an automation system (likely an Easy Touch). My variable speed pumps (http://www.inyopools.com/Products/00000017069223.htm) are less than 1 year old and evidently not supported by typical automation systems (Intermatic being the only exception). As a result, they will only be able to each run at a single speed. This leads me to consider the following:
1) run one pump at a low speed (e.g., 1000 RPM) for most of the day, and let the other pump run on a high speed for the rest.
2) run one pump at a low speed (e.g., 1000 RPM) for the whole day, and let the other pump run on a high speed for a few hours per day.
Which option is better and how should the pumps be plumbed (i.e., serial or parallel)? In the computer cooling systems world, it seems like serial is the way to go.
Feel free to also say that all of these options are bad (and yes, I do realize that life would be easier if I just bought an Intelliflow and forgot about these pumps).