Dutch mate of ours who used to have a pool with solar heating said it's a good idea to have a stat that switches it off at 32 as if not you risk not only algae but aalso legionella.We left the pool cover off last night as it was 32° anyway the bloody house martins and wag tails have been bathing and drinking. But they are getting ready to go as no nests seem to be chirping anymore.
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it’s refreshing temp now 29°
J
Dunno if he's right! Our's never gets that high but our other friends' does.
Best tellum!