How to heat a pool?

I have a pool 10 feet wide and 3 meters deep at the center of the court. Is it a low-cost heat the pool from a pool cover does not seem to help?

You can build a solar box if you are within range hand. Build a box of "high and 4 wide '2. Cover the top Plexiglas. Paint inside and outside black. Make a adapter to fit your line filter as it will pump the pool and the coil of line in the box. The sunlight will heat it quite effective. You can also just take the line of the pump, which are stretched over the pipe, between two pieces of black plastic and hold it with some landscaping rock. This will be the cheapest ways to heat the pool.

ICE SWIMMING POOL HEAT PUMP ICE11.5/16KW