On my pool's CAD drawing, it shows that my pool's design can turnover the 16,700 gallons in 1.78 hours. I presume that means running the variable-speed, 1.5 HP pump at full speed.

I'm currently running my pump at 1800rpms after months of running it at 2000rpms with good results. 1800rpms is very close to running the pump at half-speed.

Question: If my pump is running at half-speed, does that mean the turnover rate doubles -- in my case, from 1.8 hours to 3.6 hours?