I’m using an Elma and Vinyl Spin, with an external DIY 1um pump filter circuit and the finishing touch of a VPI 16.5 to extract residue loosened but still in the grooves after ultrasonic cleaning. I’m suspicious that the high-priced integrated units are conceived mostly for ease of use, and that their automated brushes and inboard filtering circuits may be less effective than manual techniques. They are certainly added points of failure owing to complex mechanisms. The Elma offers both 40 and 80K frequencies. I can’t hear any improvement at 80K. At 80K there is much less ultrasonic energy communicated to the LP, as measured by the increasing heat of bath temperature during the cleaning cycle. This could be a good or bad thing w/r to safety and cleaning results. But there is no damage to the LP provided that the Vinyl Spin keeps spinning. I have melted LPs on the few occasions that I forgot to engage the spinner. One or two lessons like that and you won’t forget to turn it on.