Is there anyone who can assist in desiging an (affordable) all natural plunge pool? Current thoughts are to construct a concrete slab, use CMU walls and coat with SaniTread as the water proofing. I’ve seen simple plumbing designs like the one shown in this video (https://www.youtube.com/watch?v=m-Dgwt_u1ug), but I want to install some laminar jet fountains and think the plumbing is more complicated than shown in the video. Thanks in advance!