JDR OH worked in pools for the last 20 years either as a manager or plantperson both post needed qualifications in water treatment. His friend who lives near by to us worked in pools for over 40 years and they are both in agreement that if a pool is well looked after then there is no need to have it running higher then 2%, thats not to say ours hasn't because even experts make mistakes. The sun does make a big difference to levels as well and you have to work that little bit harder to achieve a good reading.

the list is endless.............

Knew you would take the bait

Probably right for indoor pools in the UK, but outside pools in Spain better to have it higher, as you say it reduces during the day due to the sun.
I am liable if anyone swallows a waterboatman or tadpole. ;-)

There is only a couple.

I bow to everyones expertise, certainly not gong to argue with two fellows that have 60 years experience between them I would end up being thrown in the pool and the cover being put on tightly

bet I could guess who they are.................I'm not going to, but bet I could.

Hasn't he got quite wrinkly by now

He thinks he is a sultan but more like a sultana ( I knew one of you wouldn't be able to resist)

I'm just so predictable