I live in Las Vegas, NV, I have 16k gallon fiberglass pool, filled with new water last year and it was perfectly fine, i used Chlorine tabs and SHOCK from COSTCO - [sodium dichloro-s-triazinetrione hydrated] - 1 bag a week, after every moderate to high usage, took the water sample for testing few times until Oct-2015 and they said all the numbers were perfect - i was advised to keep continue to do what i was doing, from Oct2015 - May2016, i have not gone to test the water as it was winter and didnt use the pool but now and then i kept putting a bag of shock, after several rains recently in May2016 started to see tea stains suddenly all over the walls and when i run it was chalking quite a bit....I added couple more bags of shock and when i took sample to Leslies they said the water is acidic 7.0 and i got to add Soda-Ash and i did but i was not comfortable so i emptied the pool and filled with all new water immediately but the chalking still happens and makes the water so cloudy, when i go under the water to run off the tea stains they dont go but when i rub the powdery thing wipes off of the walls.
Can someone help suggesting what i could do?
Also when i went to Leslies they say SHOCK adds HIGH PH and i just finished a call from pool servicing company to hire them to service the pool weekly and the guy says shock and chlorine tablets lower the PH, I am completely confused. Other day i asked if liquid chlorine is better or Shock, Leslies said SHOCK and the pool guy says no shock and tablets at all just liquid chlorine and muriatic acid should be used, I am worried if i hire him for weekly services he is going to add muriatic acid to the fiberglass and it could damage further.
The Filter catridges are not that bad but i am planning on getting them replaces as well, not sure if the cloudyness will reduce if i change to new catridges.
Any advice is appreciated.