Sera PH-minus safely lowers the PH value in freshwater aquariums. In case of PH values above 7.0 and KH values above 6°dKH add 5 ml sera PH-minus per 20 liters (5 gal.) of aquarium water. In case of PH values of 7.0 or lower, and/or KH levels below 6 °dKH, add 1 - 2 ml sera PH minus per 20 liters (5 gal.) of water.
Size Item No. 250 ml 03550