Doing my best but new to this forum... so all the usual noob considerations requested.
My (old) filter has a leak at the bottom so I'm looking into replacing it (because I've been told and read repairs on older equipment isn't really worth it). All equipment issues/discussions begin with flow rates. I'm trying to determine my actual flow rather than what every contractor has been telling me: "look it up the manufacturer website and take their word for it."
The guy quoting me on a new filter said I'm getting 80gpm per pump spec.
My test has been: Submerge a 5 gallon bucked in the pool well below the water line. Insert the squid hose (minus the squid) into bucket. Raise the bucket levelly. As the lip of the bucket crosses above the waterline, start a timer. When the hose sucks the last of the water out, stop the timer. (Quickly submerge hose to suck as little air as possible.) Repeat until you get an average number. (Yes, I'm bleeding the air out of my filter.) (Yes, I'm trying to induce as little resistance as possible when I'm holding the hose in the bucket.)
My average time is around 13 seconds.
That's around 23gpm and 1,400gph and 33,000 gpd. Which is a lot less that 80gpm and since my pool's roughly 41,000gal pool: I'm screwed.
Is my experiment ideal? Absolutely not. Is it subject to a 71% error? Doesn't seem like it should be.
What, if anything, am I doing wrong? What, if anything, can you suggest?