When the buyer looked at our design, he asked, “Why do I need a screener? Is it necessary to screen fertilizer powder?” Actually, a rotary screener is indispensable for every powder fertilizer maker, because it can improve the purity of his fertilizer. As we know, animal manure usually has undigested grains, little rocks and leaves. You need to screen these things, or the quality of your fertilizer powder may not be up to the national standard. After we explained it to our client, he realized the importance of the process of screening composted animal manure. Then, he asked for another screening sieve, as a spare.