I have a 5000 gal 16' Intex ABP. I set it up 2 weeks ago. I have been following the advice here on how to lower alkalinity. We have not added any other chemicals except ph down. we have gone through a lot of ph down with the areation. How long should I keep this up before adding chlorine/sanitizer? I have a friend that opens pools for a living who says not to worry about the alkalinity but that goes against everything I have heard. He stressed the importance of getting clorine and algeside in the pool. I have read to not add anything until you get the ph/alkalinity down. After 2 weeks of dropping the ph to 7.0 and raising it to 8.0 with areation, reapeating over and over, we have the alkalinity down to 400.(it was 490) DOes this sound right?