Hi all, we’ve had our 18,000 gallon pool for about 2 weeks now and I just conducted my first test using the TF-Pro kit. (Had our water tested at our local pool store first 2 weeks). After entering the results in the pool math app and seeing my results, do I simply just go to a store and by the recommended chemicals and dump the recommended amount in and call it good until the next weekly test? Sorry for the total newb question. Lady at the pool store sold us 4 gallons of liquid shock and said to put a gallon in every week and as long as the PH is good we’ll be fine. Somehow I have a hard time believing that….