1. Credit name: revise credit name from "Cooling Tower and Process Water Use" to "Optimize Process Water Use"

2. Credit Intent: delete "and cooling tower makeup" and "microbes" so that the sentence reads as follows: "To conserve water used for mechanical processes while controlling corrosion and scale in the condenser water system."

3. Revise title of Option 1 to "Cooling Tower and Evaporative Condenser Cycles of Concentration"

4. Revise the maximum levels for all parameters in Table 1. Maximum concentrations for parameters in condenser water as follows:
Parameter Maximum level
Ca (as CaCO3) 600 ppm
Total alkalinity 500 ppm
SiO2 150 ppm
Cl- 300 ppm
Conductivity 3300 µS/cm

5. Above Table 2. Points for cooling tower cycles, add the following sentence: "The materials of construction for the water system that come in contact with the cooling tower water shall be of the type that can operate and be maintained within the limits established in Table 1."

6. In Table 2. Points for cooling tower cycles, revise the text in the first row of the "Cooling Tower Cycles" column: replace the word "filtration" with "maximum concentration".

7. After the sentence "Minimum percentage recycled nonpotable water used in cooling tower makeup should be based on water use during the month with the highest demand for make-up water." add the following sentence: "Projects may consider using water reclaimed from another process as a source of makeup water for evaporative cooling equipment as long as the resultant circulating water chemistry conforms to the parameters established in Table 1."

8. Replace the text "Option 2. No Cooling Tower (2 points)" with the following: "Option 2. Optimize Water Use for Cooling (1-2 points except CS, 1-3 points CS)

9. Replace all requirements in Option 2 with the following:

"To be eligible for Option 2, the baseline system designated for the building using ASHRAE 90.1-2016 Appendix G Table G3.1.1 must include a cooling tower (systems 7, 8, 11, 12, and 13).

Achieve increasing levels of cooling tower water efficiency beyond a water-cooled chiller system with axial variable-speed fan cooling towers having a maximum drift of 0.002% of recirculated water volume and three cooling tower cycles. Points are awarded according to Table 3.

Table 3. Points for reducing annual water use compared to Water-Cooled Chiller System
Percentage Reduction Points (BD+C) Points (CS)
25% 1 1
50% 2 2
100% -- 3

Projects whose cooling is provided by district cooling systems are eligible to achieve Option 2 if the district cooling system complies with the above requirements."

10. Add "AND/" in front of the "OR" above Option 3.

11. In the Option 3 sentence that begins "Process water uses eligible for achievement of Option 3..." add the word "regulated" before "building water use" and add the phrase "and may not include water used for cooling" to the end of the sentence.

12. Under the three bullet points in Option 3, revise the sentence that begins "Projects whose cooling is provided by district cooling systems..." to read as follows: "Projects served by district systems are eligible to achieve Option 3 if the district system complies with minimum thresholds for recycled alternative water use."