Hoping to extend the season using the swimming pool we debated ways to achieve this. We have had a bubble cover which is great for keeping leaves out and certainly useful covering at night. We have had an abri [ like a poly tunnel ] which is certainly the most effective way of keeping temperatures up. We have had electric heating which worked but there was a high cost factor. This was all on earlier pools now we wanted something that was cheapish! simple to use and was not glaringly ugly. A friend told us about solar sun rings and so after reading all the info on the net we decided to invest in them. Our pool is 10 x5 and to cover that area we needed 11 the cost was about 400 euros. The manufacturers say we get solar heating of pool during the day and they act like a thermal blanket at night. Each ring has magnets along the edge which makes them attach to each other , a fail safe for windy days. We will make a report at the end of the season on how effective they have been.
Val says two seasons on ''not worth the faff''