Suction Side:

Skimmer1 through and including mainfold - estimated 84 ft., 2x45's, 4x90's
Skimmer2 through and including manifold - estimated 36 ft., 2x45's, 4x90's
Main Drain through and including manifold - estimated 45 ft. (including pool depth), 2x45's, 2x90's
Manifold to pump - 2x90's

Pressure Side:

Pump to filter - 1x90
Filter - Tagelus TA-60, 24", zeolite media
Filter through and including heat pump bypass - 4x90's
Bypass to heat pump through and including bypass - 3x90's, 4x45's, approximately 30 ft. to heat pump and back
Bypass to (but not including) manifold - 1x90, Jandy check valve, unused Nature2 cartridge holder
Manifold to returns - Single 1.5 inch pipe, 4x90's, probably one 90 underground to split between 2 returns
Manifold to water feature - at least 5x90's

All piping is 1.5 inch
All valves are 2 inch valves with reducing couplers

Returns:

I am using Heat Snorkels (www.heatsnorkel.com). They each have a 1 inch side jet and a 3/4 inch eyeball. I removed one of the Heat Snorkels and there was no change in backpressure.

Backpressure Readings - High Speed (See notes below):

Filter on Filter, heat pump in circuit - 23 lbs
Filter on Filter, heat pump bypassed - 20 lbs
Filter on Bypass, heat pump in circuit - 22.5 lbs
Filter on Bypass, heat pump bypassed - 17.0-17.5 lbs

Backpressure Readings, Low Speed:

Filter on Filter, heat pump in circuit - 5.5 lbs
Filter on Filter, heat pump bypassed - 4.5 lbs
Filter on Bypass, heat pump in circuit - 5.5 lbs
Filter on Bypass, heat pump bypassed - 3.5 lbs

All backpressure readings are with water feature turned off.

All backpressure readings were double-checked. The 2.5-3.0 lb difference between Filter and Filter Bypass with the heat pump bypassed is notably different than the 0.5 lb difference between Filter and Filter Bypass with the heat pump in the circuit. I don't know if this could represent reaching (or exceeding) the top end of the performance capability of the pump and/or the zeolite filter media having possibly been clogged by the 2-part "floc" product that may have reacted inside the filter due to incorrect instructions from the manufacturer.