dolomite lime(available at any garden shop)of course you know a soil "ph"of 6.2-6.5 for soil,will give you a safe buffer zone up or down...sweet dreams....bonbon
bonbon Reviewed by bonbon on . ph level too high hi, i am 4 weeks into flowering and ny ph level is reading 4.5 too acidic,whats the most effective way to raise this level? i am growing in a mixture of soil and perlite using miricle grow 15 30 15 every 4th watering, next time i will have built up nutrients to 3/4 strength. I have some bicarbonate of soda but i understand this is not the most efficient : Rating: 5