Simply because the top three manufacturers of OEM and replacement carts recommend either real TSP or automatic dishwasher detergent powder. both of which contain phosphates. TSP substitute, which is phosphate free is not effective and I suspect that Simple Green, besides being an unknown in the pool, would also be similar. If they would list the ingredients in the products it might be a different story but they don't! When it starts being recommeded as a cleaner by the manufacturers then I will consider it.mas985 said:Waterbear,
Just curious as to why would you not use Simple Green. I have used it for three years now and it cleans very well. It disolves oil without any phosphates or foam and biodegrades so you don't need to worry about run off as well as any residue that might end up in the pool.