Installing a second pump on a larger Intec pool 52" * 24' I installed a second pump by installing PVC piping over the top with a check valve on the pool inlet side. Then added 3 solar headers on the outlet side. I also added a splitter and a shut off valve on the return lines so that I could control the volume of water going through the solar units. The return lines (2) also were installed over the side of the pool. one was PVC for the return water and the second a smaller flex line for returning heated water to the pool. I attached all pipes and lines to the pool supports with heavy duty zip lines. The pump is a smaller filter pump. This way no holes were made to the liner, the solar units raises the water temp entering the pool 5-8 degrees on sunny days. As an additional bonus we now have two filter pumps running which helps maintain the pool nicely. I also switched from chorine to Bio-Guard as this reduces the algae in the pool caused by the lower pumping and cleaning power of Intec filter pumps.