We have some customers that just know, once every 5 years or so I need to completely dump my pool and start over. Searching for this information on line you'll probably hear about 10 years. I think that may be true up north, but in Texas we have serious heat and serous algae, not to mention all kinds of trees and pollen...you name it.
There are times that we have been servicing a pool and with perfectly balanced chemistry, plenty of brushing, vacuuming, making sure phosphates are treated, pH is perfect, basically just doing all the right things. If the pool still doesn't shine and sparkle and just look down right great and you find out that the pool hasn't been dumped in 10 years or more, maybe you even test for TDS (Total Dissolved Solids) and find that to be high. As much of the chemistry and treatments and things swimmers carry in to the pool never evaporate out of the pool hence you end up with high TDS and a dingy looking pool.
At this point we drop in a pump and start over. Then we see the customer smile and see the joy of such a sparkling pool! That makes us happy. So yes, I say dump every so often.
In the city of Dallas (you should check your cities ordinances) as long as you let the chlorine levels go below 5 ppm and the pH is balanced you can usually dump the pool and in some cities may need a permit. It is usually preferred to go straight to the sewer clean-out if you can find one.
We do this all the time for green pools. If there is algae on the side of the pool then you look at chlorine washing the sides of the pool which is also a great way to clean a pool and make it sparkle.
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