What A.N Nutes are really needed for UCRDWC?

Hey guys, I've been growing for years in dwc/ucrdwc. I've always used Advanced nutes with great success. Its just getting costly. After this grow I think im going to try house and garden and see if I can cut cost while maintaining production. My question to all ucrdwc and dwc growers is what A.N nutes are necessary to increase yields during flowering?

Just their ph down. Everything else can be replaced or made for way cheaper!
I love how strong their ph down is though.