Hydrotech PURA Ultimate 19-GU-PURA Operation Manual - Manual (Page 19)

19
dEScALING THE PURA ULTIMATE
Prepare the Unit for descaling
1. Turn OFF the red power switch and unplug power cord.
2. Turn OFF the water supply.
3. Twist-off the hot drain cap on the back of the PURA Ultimate and drain the reservoir and hot tank through the
hot drain only.
4. Once completely drained, replace the hot drain cap.
5. Open the top cover and disable the UV lamp by disconnecting one of the two UV connectors/leads. This will
prevent the UV lamp from working during this process, in case any solution works its way into the cold tank.
6. Mix 1 bag of ScaleKleen (7 oz. bag of non-toxic citric-acid-based descaler) with 1 gallon of hot water in a
separate container or pitcher. Check ScaleKleen availability at your dealer. Stir well, and add red or green food
coloring to the solution in order to make it easier to tell when the solution is completely flushed from the unit.
descale the Hot Tank
1. Pour ½ gallon of the mixed descaling solution directly into the empty reservoir, and allow the solution to fill the
hot tank. Ensure the hot tank fills completely.
2. Plug in power cord and turn ON red power switch on the back of the unit. Allow the hot tank to heat for 5-10
minutes.
3. Turn off red power switch and allow the solution to sit in the hot tank for an additional 10-20 minutes.
4. Remove the hot drain cap only, and drain the reservoir and hot tank completely. Replace the caps.
5. Turn on the water supply.
6. To speed up the rinsing operation, use a separate line from the water supply to fill the reservoir directly rather
than waiting on the slow make-up from the RO system or Pentek Cartridge System bring a few jugs of freshly
prepared RO water.
7. Once reservoir is filled, pull the hot drain cap and continue draining water through the hot tank, leaving the
water supply on, allowing the unit to take-in fresh water as the hot tank drains. Let the unit drain and flush for 5
minutes.
NOTE PURA Ultimate units using an RO configuration should rarely need to be descaled.
NOTE do not drain the cold tank; this will keep the descaling solution from entering the cold tank.
NOTE It is not necessary to fill the reservoir tank with descaling solution.
NOTE Latex gloves must be used when handling the filters, UV bulb, quartz sleeve or any
components that have contact with the drinking water.
cAUTION! drain water will be hot! Once drained, replace the hot drain cap.
cAUTION! drain water will be hot! Once drained, replace the hot drain cap.