These ring compounds are maintained in a concentration of between 0.01 and 4.0 grams per liter of {TAIL ~ solution} in {HEAD ~ the bath} 
These ring compounds are maintained in a concentration of between 0.01 and 4.0 grams per liter of { TAIL ~ solution } in { HEAD ~ the bath }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD