PF of a 10k pool is 12.

Available chlorine of dichlor is usually either 61% or 55%. Assuming 61%, 1lb x 0.61 x 12 = 7.3 ppm FC per lb of dichlor in a 10k gal pool.

Dichlor adds about 9 ppm of CYA for every 10 ppm of chlorine, so 7.32 x 0.9 = 6.6 ppm FC

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Each pound of 61% dichlor will add 7.3 ppm of chlorine and 6.6 ppm of CYA to a 10K pool