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I've heard that you should drain and refill your pool every 5 years or so... If my chemistry is balanced and the water clear and clean, is there really a need or benefit to replace it ?
In my opinion, if it aint broke, don't fix it.
Just curious what the opinions are among the experts :D
Over a period of 5 years you may well have already done that via topping it off after backwashing and replacing splash-out and evaporation.
Pool water is sort of like the air in bicycle tires. You don't let it out and replace with fresh every so many miles, you just add a little air when they're low.
AnnaK (by no means an expert)