Appendix B Aqua-Sensor Guidelines; Aqua-Sensor Application Guidelines; Hardness Vs. Salt Dosage; Resin Bed Depth/Estimated Capacity Per Inch At Various Salt Dosages - Culligan CTM Series Installation, Operation, And Service Instructions With Parts Lists

Appendix B Aqua-Sensor Guidelines

Aqua-Sensor Application Guidelines

Parameter
Hardness (gpg as CaCO3)
Soluble iron (ppm as Fe)
Manganese (ppm as Mn)
Hardness versus Salt Dosage
TDS to Hardness Index
Temperature, °F
Alum and phosphate
Commercial cell: distance between
sensing and reference cell pairs

Hardness vs. Salt Dosage

Hardness (gpg as CaCO3)
7-10
10-15
15-25
25-50
50-75
75-99
Resin Bed Depth and Estimated Capacity per Inch at Various Salt Dosages (Downflow)
Table 21.
Depth
Resin
Model of Resin
Qty
60K 2
90K 3
120K 4
150K 5
210K 7
* 300K, 450K and 600K models were not designed to be used with an Aqua-Sensor.
NOTE
1. Although the Aqua-Sensor device has been used successfully on water with hardness as low as 3 gpg, there is an increased
risk of missed signal (no regeneration) when the hardness is less than 6 gpg.
2. For each tank diameter, there is a specific volume of resin in the space between the cell pairs. The capacity of that resin is
influenced by hardness and salt dosage. Any combination of flow rate and hardness that causes the hardness front to pass
through that volume of resin in less than 6 minutes will result in the sensor failing to detect the need to regenerate. In gener-
al, the volume of resin between the cell pairs on commercial units will permit a proper signal at or below the continuous flow
rating when raw water hardness is less than 50 gpg. At higher hardness levels, it may be necessary to reduce the flow rate to
assure adequate sensor signal duration.
3. If precipitated or bound iron is present it must be removed before the softener.
4. Manganese can deposit on the sensor electrodes, particularly on the upper pair, causing missed signals (no regeneration).
Periodic cleaning may be needed to maintain satisfactory performance.
5. Adequate signal strength has been demonstrated at ratios as high as 14, but signal strength diminishes with decreasing TDS
to hardness index.
6. Amount shown is based on the distance between the referencing cell pairs. Reserve capacity at salt dosages less than 15 lbs
per cubic foot are shown for reference purposes only and may not provide adequate representation of actual capacity per inch
of bed depth for operational purposes.
94 Culligan® Culligan Top Mount (CTM) Water Softeners
Table 19. Aqua-Sensor Application Guidelines
7 - 99 (See Notes 1 & 2)
< 2 (See Note 3)
< 0.5 (See Note 4)
See Table 20 and Note 2
TDS hardness (as CaCO3) <10 (i.e., hardness must be at least 10% of TDS; see Note 5)
Any within equipment's operating range
Anecdotal evidence indicates potential foulant; effect has not been confirmed
experimentally
6 inches (See Note 2)
Table 20.
Resin Bed Depth and Estimated Capacity per Inch at Various Salt Dosages (Downflow)*
Grains Capacity
per inch (15 lb/
(in.) ft³ salt dosage)
22.5 2667
25.8 3488
34.4 3488
34.0 4412
35.0 6000
Value
Hardness vs. Salt Dosage
Recommended Salt Dosage (lbs/ft
Grains Capacity Grains Reserve
per inch (6 lb/ft³ Capacity@15 lb/
salt dosage) ft³ salt dosage
1778 16002
2326 20928
2326 20928
2941 26472
4000 36000
)
3
5-6
6-8
8-9
9-11
11-12
12-16
Grains Reserve
Capacity@ 6 lb/
ft³ salt dosage
10668
13956
13956
17646
24000
94 Cat. No. 01029401