Sub Irrigated Planter Diy . There are plenty of systems available for purchase online and from garden stores, but this diy version gives more creative freedom. Buy a retail kit, that has been tested & proven to work. SpaceSaving and Effective SubIrrigated Planters (SIPS) Diy self from www.pinterest.com Seat the upper bucket inside the lower bucket. Use the 15.5″ 2×4’s to secure 3 pieces of stock length 1×6 boards together. (this will act as your overflow hole) cut a 45 degree angle at one end of your pvc pipe and insert the cut end through the 1″ hole in the upper bucket.