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I finished one of our two BSs. Each has 50kg of BH media and a flow rate of 3000gph.. ORP seems to have gone up from 325 (which has been our avaerage reading for more than a year) to over 340. I hope to have the second one connected before 4th of July. If they raise the ORP to the 350 range, me and the koi would be happy campers.
Will advise in July when both are up and running.
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