DIY EMT Solar pool heater

Throwing this out to see if it is viable. 100 feet of 1/2 EMT is 26 bucks at Homey Depot. 5/8 hose has an ID of 1/2 and my 550 gallon pool already has a 350 gph pump for its filter. I was thinking of cutting the 10 footers in half to give me 20 5 foot sections. mount them to a 4X4 plywood base with foil glued to it shiny side out with a 2x4 as a riser on each side. Use sections of hose at 180's to make the back and forth connectors. Spray paint the whole tubing and hose run flat black and plumb it from the filter pump back into the pool. Lay it facing up next to the pool at the slightest angle just above the pump level so its not fighting the smallish pump. Do you think its worth $30 in parts or would it just be a waste of a saturday? Wonder what the temperature delta would be, or would I just be cooling black pipe? Ambient air temp is gonna be about 80F and it will get direct sun about 7 hours a day. Filter Pump is on the whole time its light out. Current water temp is 66F, chilly even on a hot day. I always liked turning on the black garden hose and rinsing off for the first 30 seconds out of the pool at my parents house, Almost hot water in that black hose!