We have moved away from them for most members. We've come a long way since the BBB days. A third of a million members reporting real world results will do that.
More chlorine is the answer. I wish people obsessed over having enough chlorine, the way they obsess over trying to find ways around chlorine.
Me ? I target above target range and that little bit of extra covers me for anything that pops up, such as a particularly high UV day, a big storm, or an impromptu get together. When I lose FC, I fall back into target range, not below it.
ORP is a proxy measurement. How it correlates to FC is going to be unique to most pools as the chemistry of the water can affect ORP readings in addition to the chlorine levels. Heck, even sunlight affects ORP. You would be best served by not putting false hopes into an ORP probe. Get your FC in the right range by using a direct measurement test kit (DPD-FAS titration) and then simply use ORP as a reference. It is not a replacement for actually measuring FC.
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