aquatic life rodi

I bought an Aquatic Life 4-stage RO/DI Buddie that includes the DI and all. First couple batches of RODI water tested at 0 TDS. Last batch I just made shows 1 TDS, this was after about 25g of RODI water was made with this brand new. My waste ratio is about 3/1. Am I needing a better unit or is...