The phrase "inexpensive filler" means something that is cheap and can be used to fill up a space or fill in gaps, but is not of high quality. Full definition
There are also a number of questionable ingredients such as inexpensive fillers and low - quality supplements which may do more harm for your dog than good. (dogfoodinsider.com)
Your focal points draw attention to the gorgeous tree, and you save money by using inexpensive fillers. (jamaligarden.com)
When it comes to carbohydrates, you want to see whole - grain carbohydrates like brown rice or whole grain oats instead of inexpensive fillers like corn and wheat. (dogfoodinsider.com)