My wife and I follow this site regularly. We used BBB+SWG last year with our old plaster pool. This year we
refit the pool and all that is left of last years pool is the old gunnite shell.
Since she refused to post this from her account with a 10' pole, this may be the first post from my account...
I thought I would drop ot in the Deep end and see if anyone had suggestions for me. Especially after seeing.
I spent three years of High School, and a year of College studying Chemistry, and I currently work onOriginally Posted by learthur
electronics and computers for a living, so I think I can wrap my head around this if I can just a bit of help
The back story is:
We are often away from home, so to protect our substantial investment in pebble finish we chose to
up the stakes on automation system. We now have a Chemtrol 2000 with a full battery of sensors running
the show. This allows us to see and control ORP PH Temp and TDS from anywhere with internet access.
While most of the system is working very well, I have had a very hard time getting the ORP sensor to
be consistent with the FC from our Taylor set. We have been keeping the PH at 7.5 per the manufacturers
instructions on the chemtrol, but I keep seeing wacky curves that go the wrong direction, stay flat, or return
numbers that are completely anti-intuitive on the ORP readings.
We have reached our target chemistry, but still the ORP floats all over the place.
BDI 90 (Ideal) (Bartier Disinfection Index)
NaCl 3200 ( reported by digi-200, backed by what we actually added )
TDS 7600 ( reported by chemtrol )
Temp 79 F
The CO2 system runs only about 10 min a day at 20 cfh, so I don't think
that I have a problem there. ( 50lb tank may last the summer at that rate )
I saw these two posts that got me thinking, but did not get me quite far enough.
Is there anything that would be causing the gas to remain in suspension, or anything I can do that would help force it out?Originally Posted by JasonLion
What is "ORP lock" exactly, and how do you best get there?Originally Posted by JasonLion
Am I missing something obvious. I know that in my research I came across an article mentioning Borates can change your
ORP ( I assume due to their buffering effect) We also have a trivial amount of "Jacks Purple" ( <2ppm ) floating about, and I
recall seeing that sequesterants can affect the ORP.
I honestly thought this would be as simple as dialing the pool in to the proper FC level at 7.5 PH and telling the system
to maintain the ORP that corresponded, but I am seeing that it is not that simple.
Any advice other that not using the ORP would be welcome. ( We are using the automation to supplement our Taylor testing
when we travel not as a replacement)
Thanks for your help.