i said quote.. adding sawdust in limited quantities will make the compost and finally the soil more acidic. so i am suggesting adding it i limted quantities to THE COMPOST HEAP, not directly to the soil.
yes, you are right alot of shell is need to make it more alkaline but if you are growing something in pots and you keep chickens it isd not a big deal, furthermore i live near the sea , the other alternative is lime, but it must be the right kind of lime