I've got a 15ft Intex frame pool, It's heated via a air source heat pump. I'm in the UK so the weather isn't exactly warm so I'd like to preserve as much heat as possible. I've got a decent solar cover and last year wrapped the sides with a bubble wrap type loft insulation.
Basically I'm just wondering the best way to insulate under the pool, I've been looking at foam but for the area I need it was very expensive (£300+). I've had a look at b&q etc but can't seem to find anything.