I'm back with some random thoughts and observations. here goes.
* We finally got consistent good weather over the weekend and I was able to apply the Dupont Stonetech Saltwater resistant sealer. The process was fairly straightforward and so far my impressions of the product are good. I hosed down all of the stonework and travertine decking and let it dry for about 3 hours. Once the surface was dried, I was able to apply the sealer. I had to use a roller and a brush for application as this sealer is not recommended to be sprayed as it has potential to oxidize and harden as it leaves the sprayer. This can make sealing large areas tedious, as it was for me.
I sealed roughly 1000 sq ft of travertine decking (1 coat). 133 ft perimeter of OK flagstone coping (2 coats). and another 1 coat on raised bond beam/spa stonework and retaining walls. All in, about 5 gallons of sealer.
The sealer is water based, consistency of 1% milk. It goes on easy, absorbs quickly, and leaves no white residue upon drying. Very easy. Cure time is 72 hours before water can touch the surface
* The intellichem is an interesting product. Keeps my PH rock solid at 7.5, no problems here. Like others in the forum have eluded to, the ORP monitoring is quite unreliable and serves as more of an information data point for process control. I have been monitoring things very closely and can share some observations and theories. ORP definitely drifts up about 50-100 mv as the sun goes down. My theory on this is as the sun rises, the chlorine is more prone to bind to the CYA, thus making the chlorine less effective which lowers ORP. I keep the CYA at 50
The other interesting observation is that once salt was added to the pool, which subsequently increased TDS, I have noticed that the ORP/FC relationship has reversed. Instead of ORP increasing as chlorine increases, it now actually DECREASES - very strange. I found this out the hard way as the intellichem had the intellichor producing chlorine at 100% for the full pump run time which had my FC levels at 10, while ORP was sitting at around 525mv. Manually adjusting the intellichor output and getting FC back down to 4 (with cya of 50) has brough the ORP back up to 650.
* I am still seeing a lot of negative posts when people request advice on in-floor cleaning systems. I also see quite a bit of false information. The bottom line is that is works (at least for me). I have high standards for how clean my pool is and this thing does the trick. I have never used a robot or vacuumed manually. The concerns about power consumption are also overblown. I run my intelliflo roughly 12 hours a day. 9 of those hours are at 1750rpm, which translates to 380w and 35GPM flowrate. 3 hours are at 2800 rpm, which translates to about 70GPM flow and 900w. With my electric rates at 10 cents a kilowatt hour, this is about 30$ a month all in - not bad at all