Thanks for the feedback. I really don't know why I am having so many issues/problems making decisions for this bathroom. Perhaps because we started serious DIY renovations on this 70's house 6 years ago, were going to add an addition for this BR and had hired and started to pay a design/builder who we basically fired after receiving an estimate of $70K to frame a 210sq ft addition! I think I went through a grieving process at losing my dream bathroom (life intervened, and we ended up helping our son buy his first home), and it took me over a year to actually get this project moving. So, good news, I just handed over my Visa, and I'm getting the Riobel system in brushed nickel with thermostatic valve and volume control! Emco also carry the Moen Iso line, so I'm getting all my BR accessories in brushed nickel too at less than the HD price in chrome, so I'm one happy camper. I went to a plumbing supply store, and asked them to give me a quote to compare apples to apples...so she knew without my saying so, that I had gone to another showroom. When I rec'd the quote this morning, it was lower for all items except the main valve, which was higher by $22. I told her it was good, except for the one valve, and she met that price. I wasn't pushy or demanding, just honest. I hope to be able to share that the Riobel system works great! Supposed to be very good, and I like the idea that it is a Canadian company, made in Canada, and I don't have to worry about shipping, duty and having to deal with a foreign company if problems occured... Glad I didn't have to give up volume control, my Brushed Nickel finish (which in some lines was going to be exorbitant), or my thermostatic valve! On to the next..gotta pick between two colours of my limestone lookalike porcelain tile...

Don't forget a balancing loop of some sort for the side sprays if you want them to come out evenly. This is a lot of water, hopefully you're feeding this with 3/4" pipe. Keep that going through the thermostatic valves up to the volume control input. I've got about the same thing with a single grohetemp thermostatic valve, grohe volume controls and only one set of side sprays.

You might want to try the plumbing forum or go over to the Terry Love plumbing forum and ask that question.

Maybe there could be debris, and I could have the plumber come back next week if the pressure won’t go back up. However, I’d stil like to know if there is any method to vary the pressure on the hot water side so it isn’t just full pressure or nothing. I’d like to be able to adjust the water volume on the fly and maybe use more pressure when I turn on the hand held attachment to wash out the shower and spray away Bon Ami residue from the tile than I would use for actually showering. I neither want to shower under a power washer nor have such low water pressure that it can barely rinse the soap off.