Hey Chin,
I did try that store "Ideal Pool and Spa" and they don't have neither the dow-flakes, nor the cal-spa!!!
Actually they did have the dow-flakes but in 50lbs bag, and for a 72 gal tank, that will last me somewhere near 100 years
so I can't justify buying that.
They had their own brand, which is called Calcium!!!
Can I use that? or is there anywhere else I can go for dow-flakes or spa-cal???
Thanks again.