During feeding, it is necessary to avoid the concentration of large-size stones on one side and small-size stones on the other side, so as to ensure uniform mixing of stones.
Mgbe ị na-eri nri, ọ dị mkpa iji zere ọnọdụ ebe a na-etinye nkume buru ibu buru ibu n'otu akụkụ na obere obere nkume dị n'akụkụ nke ọzọ, iji hụ na a gwakọtara nkume ndị ahụ n'ụzọ zuru oke.