I have had a salt system on my pool for the past 4 years. It has been replaced 4 times due to failure. I have had it and I am switching back to chlorine tablets. I had a guy tell me at the pool store that to do this I will have to drain at least half of the water out of the pool and refill it with fresh water before switching to chlorine tablets. can anyone offer any advice? is this true? what do I need to do to switch back to chlorine? has anyone done this before?