Dozerman

The very best, permanent solution would be to jack the tub up (after draining it) and get some lumber to build forms around the top of the existing slab. Use self-leveling concrete floor leveling compound to make the slab level. It looks just like cement powder but you mix it really thin so if flows level on its own. Once it cures, overnight is long enough, I would add a layer of Styrofoam insulation on top of the cement before lowering the tub. Optional but it will eliminate any stress points under the tub frame and ensure equal weight distribution. This is probably overkill and any of the above suggestions would likely do it for you, but this is the way I would do it.

Ontario Canada but willing to pay for shipping.

I have a 2008 Coast Helios that I purchased in 2014. I have replaced pumps, plumbing, gutted the insulation and fixed piping after rats got into it, replaced the spray foam, and on and on... The point is, I have a lot of time invested and I am quite attached to it. Now I have discovered a new and more serious problem... these 7.1Hp red Monster Flow pumps with the front discharge wet end are discontinued.... as are replacement impellers. I have 4 working pumps, but only 3 impellers and seals are no issue (so luckily I have 1 spare)... If anyone knows of any old stock hiding somewhere I'd love to know about it. The Waterway part number is 310-2600. As an option later on, can I use a 5hp executive wet end on those 7hp motors? I know they will fit physically, and that I will need to do some ugly plumbing, but will the motor destroy the lower rated wet end or would it work OK?