2 time pre soak each time 5 min (an experience that I didn't like the result)...
Recipes & dev times using Developer Ilford Ilfotec DD-X
Ilford FP4+ 125 at 400 in Ilford Ilfotec DD-X 1+4
18 minutes, 30 seconds at 18°C/64.4°F
Ilford FP4+ 125 in Ilford Ilfotec DD-X 1+9
35 minutes (Stand developed) at 20°C/68.0°F
Ilford FP4+ 125 in Ilford Ilfotec DD-X 1+4
10 minutes at 20°C/68.0°F