For capacity reasons, {TAIL ~ several ultrafiltration modules} may be required in {HEAD ~ an industrial environment} 
For capacity reasons , { TAIL ~ several ultrafiltration modules } may be required in { HEAD ~ an industrial environment }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD