That is the same size we have! Although not the same pool. We use the Hayward 21” S210T pro-series sand filter with the Hayward power flow matrix 1.5 HP. I had my husband add a vacuum line and we have a second return that flows into our wedding cake steps. We could have gotten by with a 1 HP but our 22’ rusted out Feb of last year after only a year and a half. We were lucky to find this 18 x 54 for the meantime. The pump works great if a little too big. I CAN NOT RECOMMEND NOT ADDING A SEPARATE VACUMM LINE! It’s awesome and so easy just like an IG pool. All I have to do is plug the hose in and I can run the skimmer at the same time too!