Arishtam stocks Stainless Steel wort chiller because of the following reasons:
Most locally made copper or aluminum chillers are made from AC ducting tubes. These air conditioning tubes are meant for industrial use to carry refrigerant and not food material contact. As a result, they are often dosed with lead and other heavy metal which helps in making these tubes harder and stronger. Unfortunately, that makes it hazardous for use in brewing. Stainless Steel chillers are better suited for chilling kombucha tea, honey mead, and milk for the cheese industry. Unlike copper, Stainless Steel does not react to low acidity, also it is easier to clean any grime/deposits that can get accumulated. Stainless steel is inert and does not accumulate the green rust that eats away your pipes. Hence it has a much longer life than a copper chiller. Pure food-grade copper is very soft and prone to pinching and denting which can render your equipment useless as the pipe will get blocked. Stainless steel is much tougher. SS-304 does not react with acid-based sanitizers that can eat away your copper metal over time.