I did some flow testing last weekend. I measured the time to fill a 5 gallon bucket. In each case I ran the components listed, but through a 3/4" hose, back into the Grizzly. I'd let it run until the flow was steady, then move the hose to flow into the bucket. I was a little surprised by the findings:
Pump + empty filter housing = 47s
Pump + filter = 47s
Pump + filter + chiller = 57s
(5gal/47s) x 3600s/hr = 383 gallons per hour
(5gal/57s) x 3600s/hr = 316 gallons per hour
So, why was I surprised?
1. Absent the chiller, I really expected the filter to be the main limiter of flow, but it was not. The freshly-rinsed month-old filter had literally no effect on the flow. I thought about removing/testing other components (like the Grizzly drain plug with hose adapter) but I had time constraints and moved on.
2. I thought adding the chiller reduced the flow much more than it really did. It only dropped ~20%.
3. This testing means to me that if I were to add ozone (unlikely at this point) I would add the venturi in parallel with the chiller rather than the filter. That would (a) bypass the tightest pinch point with a parallel path to create more suction in the venturi, and (b) increase the net flow. However, I had no slime or indications I need better sanitation. Grocery store peroxide every couple weeks seems to be more than enough in this cold, hermetically sealed system.
I also identified a leak (just like @wintermute) at the bulkhead connection. I wiped a little silicone on both sides of the gasket and took care of that.
