Exceeding this maximum legal concentration can be very costly.Īdditionally, doses above the EPA limit are often less effective or tend to compound other problems in the system, both of which reduce the account’s profitability by using more biocide than necessary. Recall that the EPA sets stringent guidelines on the maximum legal concentration of each biocide. It is therefore imperative to know the total system volume. The dose rate of most biocides is based on ounces of biocide per 1,000 gallons of system water. The batch strength should be concentrated enough to allow 2-3 months of operation without preparing more inhibitor batch.īiocide use rates are based on the total tower system volume and the severity of the microbiological problem. Secondly, the concentration can be increased so that less batch is required for every 100 gallons of make-up water. First, by increasing the volume of the batch tanks which hold the inhibitor, we can be confident that it will hold an adequate volume to maintain a continuous supply to the tower for at least one month. Given our ability to calculate the amount of inhibitor the tower system will require over a given amount of time, it is possible to determine how much inhibitor will be required to ensure that the batch tank does not run out before your next service call. Ideally, the two values are equal, and the inhibitor level in the tower water at present is within the appropriate range. Valuable troubleshooting information may be learned by comparing the amount of water used during the past month with the amount that has been pumped out of the batch tank. Recall that most of our cooling tower controllers base inhibitor feed on make-up water. Our sales team bases the contract price for cooling tower service on the amount of water used, and precise knowledge of changes in the usage rate gives us data on which to base contract prices.Īnother important reason we record water meter readings on every service call is to confirm that the amount of inhibitor used during the period correlates with the amount that should have been used. In addition to monitoring water consumption by the cooling tower for sewage credit, it is essential to record the amount of water used by the tower system every month. Chardon’s approach is benefited by saving water because we use fewer chemicals to treat the water. Less water used means fewer chemicals sold by the vendor. Our competitors rarely offer this service because it brings to light the significant savings the customer could enjoy by operating their tower at higher cycles of concentration. Still, since the sewer charges are typically based on water meter readings, most customers do not receive credit for the water that evaporates and does not enter the sewer. Approximately 75% of the water that is added to the cooling tower evaporates and therefore does not enter the sewer.
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