We've had pools for over 10 years now and each time we take water to the pool shop to be tested were told to put excess amounts of ph up in the pool then a few hours later put near equal amounts of ph down. I know spiking ph can help to kill any nasties living in the pool however is it really necessary all the time? We got a brand new pool a week ago and were told to raise ph with 2kg of ph up then add a liter of acid a few hours after, I took a water sample today and was told to do the same thing. Is there something wrong with just adding a little ph up or down to adjust the levels slightly without using so many chemicals? Is their technique just a money spin most of the time? I did ph spikes only once a year, if that, with one of my other pools and there was never any issues with it, I just added small amounts to adjust the ph when required.
Sorry if this sounds stupid lol.