DOWEX Ion Exchange Resins WATER CONDITIONING MANUAL
DOWEX Ion Exchange Resins WATER CONDITIONING MANUAL
DOWEX Ion Exchange Resins WATER CONDITIONING MANUAL
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<strong>Ion</strong> <strong>Exchange</strong> Cleaning Procedures<br />
Table 22. Increased pressure drop.<br />
Symptom Possible Causes Remedies<br />
Increased pressure<br />
drop/restricted flow<br />
Valve(s) partially closed Check and adjust all valves.<br />
Internal distributor blocked Repair/clean distributor.<br />
Flow rate above normal Reduce flow or change to larger bead resin.<br />
Low feed water temperature Reduce flow or change to larger bead resin.<br />
Increased amount of<br />
suspended solids in the<br />
influent<br />
Fouling, precipitation, or<br />
biogrowth in resin bed<br />
Increase backwash time and frequency.<br />
Take sample and confirm with resin analysis,<br />
clean or replace resin as appropriate. See<br />
Section 9.4 and Section 10.<br />
Compacted bed Extended backwash or air brush during<br />
backwash.<br />
Resin fines Increase backwash rate to expand bed to a point<br />
6–12 inches (15–30 cm) below the outlet header.<br />
Remove or change backwash outlet screens.<br />
Resin oxidative damage Take sample and confirm with resin analysis and<br />
replace resin.<br />
Inappropriate resin choice Replace with correct resin type.<br />
Broken under drain or resin Inspect and repair.<br />
sub-fill system<br />
Excessive resin volume in<br />
vessel<br />
Re-adjust volume according to guidelines.<br />
<strong>DOWEX</strong> <strong>Ion</strong> <strong>Exchange</strong> <strong>Resins</strong> 63 Water Conditioning Manual
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