yes, after the ozone is stopped for half an hour or so the polyps opens back like normal.
i measured the orp if the water right after it gets out from the sock with carbon and i got a reading of 425.
why chlorine test btw?
Chlorine tests detect all highly oxidizing species.
Ozone and the Reef Aquarium, Part 1: Chemistry and Biochemistry by Randy Holmes-Farley - Reefkeeping.com
Ozone and the Reef Aquarium, Part 2: Equipment and Safety by Randy Holmes-Farley - Reefkeeping.com
Ozone and the Reef Aquarium, Part 3: Changes in a Reef Aquarium upon Initiating Ozone by Randy Holmes-Farley - Reefkeeping.com
from the third one:
"Was ozone being added? Clearly, yes. The water's ORP exiting my
tubing reactor measured 680 mV. I could also detect an ozone/
OPO residual of 0.1 - 0.24 ppm chlorine equivalents (details of such test methods are provided in
air flow section of the previous article). So the ozone was having the desired effect on the water in the reactor."
from the second one:
"Once the system is in operation, the air flow and other parameters can be adjusted to maximize performance. The aquarium's ORP is one easy, albeit slow, way to gauge performance. The ozone concentration in the water exiting the contact chamber, but ahead of the
GAC, can be a good gauge. A chlorine or ozone test kit can be used to detect ozone and its byproducts in seawater since these compounds will react with the reagent in a standard chlorine kit. When using a Hach CN-70 chlorine kit (using the directions for either free or total chlorine), I found experimental values ranging from 0.02 to 0.5 ppm "chlorine equivalents" in different setups that I tried, not just varying air flow). Since such kits (which are based on a method called
DPD or DDPD) detect a variety of different highly oxidizing species (hypobromite, ozone, etc.), it must be remembered that it is not an indication of just the total free ozone remaining. Nevertheless, the convention is to report all of these highly oxodizing species as if they were a single chemical (unless noted otherwise in a published study). The units can be
chlorine equivalents or
ozone equivalents, with 1 ppm chlorine equivalent equal to 0.7 ppm ozone equivalents (that value simply being the ratio of the molecular weight of O3 (48 g/mole) divided by the molecular weight of Cl2 (70.9 g/mole). Note that a test method using
indigo blue (indigo trisulfonate) tests for ozone only, and not the byproducts, so do not choose that method unless you only want ozone measurements.
The ORP of the contact chamber effluent can also be a useful gauge (mine is typically in the upper 600's mV). In all cases, the higher the ozone or ORP, the more effectively the ozone is being used (at least when the flow rate of water through the reaction chamber is approximately constant)."
