Warming a pool with solar heat requires a few solar panels hooked up to the filtering circulating system.
Build your own above ground pool heater.
Either coil the copper pipe or lay the pvc pipe back and forth on the plywood.
Start with the actual collector.
I took a 4x4 piece of plywood and painted it black.
Create as many or as few as you need for the size of swimming pool you have can be used for in ground or above ground pools.
Propane pool heaters for an average 400 000 btu heater with a price tag of over 2200 it will cost you about 10 per hour to run assuming the heater consumes around four gallons of propane in an hour of use and propane averages about 2 50 per gallon as of the time of this writing it will heat your pool about 5 degrees in that amount.
For some reason the comments have been disabled link to how to build the diverter system.
A solar assisted pool heater is very easy to construct and use.
Step 1 assemble the panels.
Diy solar pool heater.
There are only a few important parts.
Water to the solar heater.
Materials one old but useful fire pit or grill 60 foot coil of 3 8 copper tubing 10 feet 1 2 water hose plastic 1 2 female water hose adapter recommended and zip tie 6 feet black foam pipe insulator 1 2 hose clamp comes with female hose adapter above 4 wire copper pipe hangers 1000.
Mount them to the board using either adhesive or pipe mounts.
Free photons to the rescue.
Black pvc pipe works but copper pipe painted black works even better.