Combine cucumbers, onions, and peppers in a large bowl; sprinkle with salt and cover with cold water. Let stand 2 hours. Drain thoroughly; press out excess liquid. Combine sugar, vinegar and spices in a large sauce pot. Bring to a boil. Add drained vegetables and simmier 10 minutes. Pack hot into hot jars, leaving 1/4-inch head space. Adjust caps. Process 10 minutes in boiling water bath.