Solar desalination is a viable solution to provide drinkable water to remote areas using free energy, basic technologies, and a healthy environment.The challenge of low daily productivity inspires the researchers to find different approaches to increase the thermal performance of the distillation methods with minimized cost.This paper proposed a new distillation concept using solar stills.An innovative designed vertical distiller with two rotating disks was investigated.Besides, the performance of modified single-stage vertical distiller (MSSVD) and modified double stage vertical distiller (MDSVD) were studied and compared with that of the conventional tilted distiller (CTD) and conventional vertical distiller (CVD).Reaching the optimal depth of basin water and augmenting the evaporation and condensation rates of the vertical distiller were targeted.Moreover, different rotational speeds (from 0.125 rpm to 2.5 rpm) were investigated to indicate the optimum disk speed that provide the highest productivity.Exptl. results indicated that the proposed vertical solar still provided higher freshwater productivity than the CTD.In addition, using rotating disks significantly improved the distillers' yield.Also, the best distiller performance was achieved at 1.5 rpm.Moreover, the daily freshwater output was 2300 mL/m2.day for CTD, 2730 mL/m2.day for CVD, 10350 mL/m2.day for MSSVD, and 16500 mL/m2.day for MDSVD.So, the yield of MSSVD and MDSVD was improved by 350% and 617.4%, resp. over that of CTD.The maximum thermal efficiency for MSSVD and MDSVD was 48.4% and 77.2%, resp.Finally, the average distillate cost was 0.027, 0.051, 0.018, and 0.019 $/L for CTD, CVD, MSSVD, and MDSVD, resp.