Hi @ppa. Thanks for your comment. The difference in energy use certainly does seem hard to believe when you consider that natural pool pumps run 24/7, but natural pools are set up very differently to conventional pools.
Natural pools use far smaller pumps than conventional pools because the water is circulated far more slowly. In a conventional pool, the pump has to force the water through the filter, which creates considerable resistance - think of it as trying to empty a bucket through a funnel rather than simply tipping it over and letting the water flow out. In order to move the water through the filter, quite a lot of energy - and therefore a powerful pump - is required.
In a natural pool, the water basically trickles slowly through the gravel beds in the regeneration zone, which means less resistance, meaning that you don’t need anywhere near as powerful a pump.
Suction cleaners (like the Kreepy Krauly) need a powerful pump as they work by drawing the water through the cleaner. Most natural pool owners use robotic pool cleaners, which are powered by electricity, so they don’t need a large pump to operate. (More info here: https://www.choice.com.au/outdoor/pools/cleaning-and-maintenance/buying-guides/pool-cleaners)
The energy figures were based on ‘no-frills’ pools with no heating, water features, etc and were a ball-park figure as energy costs vary across the country and from pool to pool. We shared these figures to give readers an indication of the difference in energy use - and obviously this will be different for each pool owner, and costs for a heated pool will be significantly different.
Hope this addresses your questions!