Natural swimming pools and ponds
Heating a Swimming Pool - Top 10 Cost-Efficient & Eco-friendly ways to heat a pool
...yard pool for as much of the year as possible without the pool heating costing the Earth. Literally.
Reduced pool heating costs = better savings
5) Use the Cheapest Source of Heat:
Solar should always be the primary heat source for a pool which will be a combination of good location in the yard to maximize sun...