When it comes to solar heating,…. nothing beats a good solar blanket, I
switched over to a Thermoshield solar blanket, it is blue on top and black
on the bottom, makes a noticeable difference. Use the entire surface of
your pool as a solar heater, hoses and pipes will never beat it. Way too
much water in a full size pool. Do the calculation you will see.
Great plan, a couple issues. PEX degrades in sunlight. Pex grades are
different, standard not meant for closed loop system with iron parts in it,
such as fittings and pump, need to use Radiant floor type PEX, and I would
use drip mist type tubing for direct sun exposure.