To Acid Clean The Blades; Salt Chlorinator Usage Hours Meter; Cleaning The Cell Blades; Winterizing - Pentair STA-RITE SC-75P Installation Manual

SC-75™ Salt Chlorinator Usage Hours Meter
The SC-75 provides a built-in cell "usage hours" meter that reports how many hours SC-75 has been operating.
To access the system status mode:
1. Press and hold the MORE button for three (3) seconds until the lights scroll across the unit.
2. One (1) of the three (3) Sanitizer Output LED indicators (Low, Med, High) will be lit, indicating the hours of usage. The
Output LEDs are as follows:
• 2000 hours (Low LED on)
• 4000 hours (Med LED on
• 6000 hours (High LED on)
Cleaning the SC-75 Cell Blades
Note: Before acid washing, remove the calcium buildup in cell: Use a garden hose on the jet setting and spray directly into
both ends of the cell. Most of this calcium buildup has a slushy consistency and will be blown out of the cell. Once the
majority of the calcium has been removed, continue with acid washing which will now be more effective since most of the
calcium has been removed.
1. Automatic Cleaning: The SC-75 has an automatic cell blade cleaning feature (cell reversing) that helps remove scale
deposits from the SC-75 blades. Note: Automatic cleaning does not interrupt chlorine production. "Scale" is a white crusty
deposit that forms in excessively hard water or from pool water that is out of balance and in a scaling condition. If the SC-75
blades show excessive scaling, you need to perform an acid wash cleaning. Proceed to "Acid Wash Cleaning" Step 2.
2. Acid Wash Cleaning: If the SC-75 blades show a tendency to scale, it is recommended that every two (2) months the
SC-75 be removed and inspected for scale formation and/or debris on the SC-75 blades. High hardness areas may require
more frequent cleaning. Some filters allow debris to pass through to the SC-75, possibly lodging between the blades in the
SC-75. A small amount of scale formation is normal. If by looking through the SC-75, it is observed that there is excessive
scale formation between the blades, or debris is present, the SC-75 must be cleaned as follows:
Use a high-pressure jet of water from a garden hose. If the blades cannot be reasonably cleaned in this manner,
acid cleaning is necessary.
TO ACID CLEAN THE SC-75™ BLADES:
1. Disconnect the AC power from the Power Center. Disconnect the SC-75 Salt Chlorinator cell communication cable from
the Power Center.
2. Mix one (1) part acid with one (1) part tap water in a plastic bucket.
3. Submerge the blades in this solution without allowing the control panel or cables to be exposed to the solution
4. Allow the acid solution to bubble, and to clean the blades.
The acid should only be contained inside the SC-75 covering the blades. Try not to spill the acid on the outside of the SC-75.
If acid does spill on the outside of the SC-75, wash it off with water. A foaming action will begin, which is caused by scale
(calcium carbonate) being dissolved from the blades. If rigorous foaming action does not begin, the blades do not need to
be cleaned (STOP THE CLEANING PROCESS - go on to the next step). Otherwise, allow the blades to remain immersed in the
solution until the foaming has stopped. However, do not leave acid in the SC-75 for more than thirty (30) minutes. Excessive
acid washing will damage the blades.
5. Remove the SC-75 from the bucket and place in an empty 20 liter bucket. Rinse the inside and outside of the SC-75
thoroughly with clean tap water and inspect. If deposits are still visible, repeat the acid cleaning process.
6. Rinse the SC-75 again with clean tap water and inspect. Once clean, replace the SC-75 and resume normal operation.
7. If the acid wash procedure is necessary, it is recommended that a sample of pool water be analyzed by a pool professional
for excessive calcium hardness (i.e. ideal range is 200 to 400 ppm) and/or improper water balance.
8. Inspect the inside of the SC-75 every two (2) months (or more frequent in hard water areas). If no scale or debris deposits
are observed inside the SC-75 after four (4) months, it is not necessary to continue inspections every two (2) months. However,
due to possible changes in pool water chemistry and filtering effectiveness, it is recommended that the cell be removed for
inspection at least twice a year.
9. Reconnect the SC-75 communication cable plug in the Power Center, then reconnect AC power to the Power Center.

Winterizing

Very little chlorine production is needed in cold water so long as free chlorine levels are maintained at 2.0 - 4.0 ppm. The
SC-75 Salt Chlorinator will not produce chlorine below 12° C. This low-temperature cutoff extends the life of the cell. If
preventative measures are not taken, freezing water may cause severe damage to the cell. Prevent freeze damage to the cell
by running the pool pump continuously or winterize the pool by draining water from pump, filter and all intake and return
lines. Remove the cell, clean and store it.
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