Store › Redi-Rain pH Reducer Image 1 of 1 Redi-Rain pH Reducer $3,375.00 250 Gallon tote of Redi-Rain pH reducer. $13.50 per gallon. Quantity: Add To Cart Added! 250 Gallon tote of Redi-Rain pH reducer. $13.50 per gallon. You Might Also Like Quick View Time Band-it $3,237.50 Quick View Onset Seed Primer $3,625.00 Quick View Vitalife Plant Amendment $3,487.50