That has prolly more to due with the power of the pump and thing. The holes to get clogged with tap water chalk and crusty dried nutes and thing, but you can clean em up, and/or drill more holes if need be. Or use electrical tape to cover up if ya got too many holes.
That said. Waterfarms are too expensive, used to have a couple, but the design is so simple that you can make three - four DIY waterfarms with the price of one factory made.
My plants roots grew under the drip rings pipe and lifted it up so it basically serves no function at this point.