So part of my problems was that I had a faulty pressure gauge... got that swapped ...so when I cut the 1/2 “ line off at the pond manifold went back up the line pressure loss was 5.5lbs ... I’m sure your calculations were off by about the distance my guess was off of the run! Swapped line for 1.25” line and measured no line pressure! I’m now running the two deep 12’ diffusers on one 5/8 line and a shallow water 3’ diffuser and measuring 6.5#... I wasn’t able to bring diffusers in to shop to test backpressure there .. I’m going to
Add the 4th diffuser when fitting comes in and I’ll take actual depth measurements when I’m out there... thanks
