Hi,
STPP is probably banned in Laundry products as it has a very high BOD. The biological oxygen demand (BOD) for simple phosphates is very high, so they should be treated before being relesed into the enviroment.
In simple terms, when anything is released in water streams bacteria/algae etc digest it. In digesting the substance they require oxygen and take that from the water stream. Basically, if the bacteria use a lot of the oxygen in the water, there is none left for the wildlife (eg fish or plants) so everything in the river dies.
Waste from your sink/washing machine is released (untreated) into water courses. So using zeolites/silicates or phosphates in high concentrations then releasing them into water courses means there is not enough oxygen left for everthing else.
I have explained this so badly im pretty ashamed, but if you are interested then search for BOD and you will get a better explanation. This is the main reason for pouring your waste down the sewer and not the drains.
Hope this helps
Graeme
Access Cleaning Solutions