I'm currently getting approx 650 gph from my L1 at 100% on my Elos 120xl.
The return plumbing at the overflow is 3/4" and then the two outputs are 1/2" so there seems to be quite a bit of restriction.
The output of the L1 is 1.5" or if using the blue collar it's down to 1".
I use the blue collar and have 1" to the overflow.
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