Disgusting water from Thirsti

Good day

About a month ago, I bought 6 packs of Thirsti still water, consisting of 6 500 ml bottles in each pack from Makro Centurion. To our disgust, the water had a vile sandy, stony taste and had small stone particles in the water. Every pack of water had the same dirty taste. It is horrifying to know that such poor quality water is being sold, and I shudder to think about the potential health consequences of drinking such water. Where are the quality checks being done at these factories? After reading other reviews on Hellopeter, I realised that many other people had similar experiences. Clearly, nothing has been done to address these serious complaints which says alot about the company.