5400 gallon pool. Is there a DIY solar heater option?

Sure, there are many options. Partly it depends on how DIY you want to be. You can get solar panels on eBay very inexpensively and pick up the other parts you need from Internet pool supply places. Or for a little more money you can get a complete kit with everything you need. Or, more expensive, you can have someone install it for you. The first question is where do you want to put the panels. Putting them on the ground is easy and inexpensive, but doesn't look so great. Mounting on a roof adds complexity and expense. Or you can build racks to hold the panels.
 
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