Particle size and soil types dictate how fast any lime product works. The smaller the particle size the quicker it will react with the soil, but also the quicker it will be gone. Lime reacts quicker with sandy soil than with clay soil. I have used the pennington fast acting lime on sandy soil and within about 3 months raised the ph up significantly, but it wont last as long. There is no magic potion, but using the fast acting stuff in conjunction with ag lime and doing regular soil samples should work.