Two different questions.
Are you asking concerning rinse agents or presprays?
All Fiber Rinse Liquid and All Fiber Rinse Powder are somwjat different products (bad name choice in the powder).
All Fiber Rinse Liquid is primarily used for neutralizing alkaline presprays or residues, preventing browning on cellulose fibers, limiting color bleeding, and leaving pile fabrics with a salt hand....as well as assisting in the rinsing process.
All Fiber Powder has a mildly acidic pH, will somewhat neutralize alkaline cleaners, may restrict browning or bleeding, and won’t assist in the rinsing process. It is, however, also a cleaning agent, which All Fiber Rinse Liquid is not.