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In some cases, there may be more than one option for the number <br />of feed tubes and weir size to use. When this happens, keep in <br />mind that selecting the smallest possible weir size will provide the <br />best control of chlorine residual. However, this will also shorten the <br />continuous operating periods between refills. If longer intervals are <br />0--i ed, select a larger weir and more feed tubes. <br />Determine the Days before Refill - The days before refill <br />can also be calculated by completing Equations 4-6 of the <br />SANURIL SIZING WORKSHEET. In order to determine the <br />number of days before refill, the lbs. of SANURIL/day must be <br />converted to the number of tablets/day. This is done in <br />Equation 4 (f). The conversion factor of 0.31 is used, because <br />this is the average weight of each tablet. Using this value, <br />divide by the number of feed tubes determined in Section 4 <br />(5g). This will indicate the number of tablets being used in <br />each tube / day (5h). <br />Even though the feed tube holds twenty-nine (29) tablets when <br />filled to the top, it is recommended to refill the tubes when there <br />is a minimum of five (5) tablets remaining in the tubes. <br />Therefore, in determining the days before refill, the number of <br />tablets used is twenty-four (24). By dividing the number of <br />tablets in the tube by the number of tablets being dissolved per <br />tube, we can determine the number of days before refill (6i). <br />Example: 0.59 lbs of SANURIL / day (3e) divided by 0.31 lbs. <br />SANURIL/ tablet = 1.9 tablets of SANURIL / day (4f). 1.9 <br />tablets of SANURIL / day divided by 3 feed tubes (5g) = 0.63 <br />tablets per tube/day (5h). 24 tablets/tube divided by 0.63 <br />tablets used/tube/day = 38 days before refill (6i). <br />The procedure for sizing the Model 1000 or 1001 as <br />described above are considered to be the long version <br />for determining the number of SANURIL tablets required. <br />It is necessary to go through all the steps in order to <br />calculate the intermediate values needed to select <br />the proper number of feed tubes and weir size open- <br />ing. In Table 1, the number of SANURIL tablets required <br />to deliver a desired amount of chlorine at a given flow <br />rate has been provided. <br />This table follows the simplified equation as described <br />below: <br />mg/I C12 required x flow rate, gpd x 0.000038 = number of <br />SANURIL tablets / day. <br />For example, using the same values used before; we <br />need to deliver 5 mg/l Cl2 at a flow rate of 10,000 gpd. <br />Following the simplified equation we have: <br />5 mg/ICI2 required x 10,000 gpd x 0.000038 = 1.9 <br />SANURIL tablets / day. <br />TABLE 1 <br />NUMBER OF SANURIL TABLETS PER DAY* <br />Based on Chlorine Required <br />F } <br />Chlorine Required, mg / I (ppm) <br />Chlorine Demand + Chlorine Residual <br />Flow Rate, gpd <br />2 <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />2,500 <br />0.19 <br />0.29 <br />0.38 <br />0.48 <br />0.57 <br />0.67 <br />0.76 <br />0.86 <br />0.95 <br />5,000 <br />0.38 <br />0.57 <br />0.76 <br />0.95 <br />1.14 <br />1.33 <br />1.52 <br />1.71 <br />1.90 <br />10,000 <br />0.76 <br />1.14 <br />1 1.52 <br />1.90 <br />2.28 <br />2.66 1 <br />3.04 <br />3.42 <br />3.80 <br />15,000 <br />1.14 <br />1.71 <br />2.28 <br />2.85 <br />3.42 <br />3.99 <br />4.56 <br />5.13 <br />5.70 <br />20,000 <br />1.52 <br />2.28 <br />3.04 <br />3.80 <br />4.56 <br />5.32 <br />6.08 <br />6.84 <br />7.60 <br />25,000 <br />1.90 <br />2.85 <br />3.80 <br />4.75 <br />5.70 <br />6.65 <br />7.60 <br />8.55 <br />9.50 <br />30,000 <br />2.28 <br />3.42 <br />4.56 <br />5.70 <br />6.84 <br />7.98 <br />1 9.12 <br />10.26 <br />11.40 <br />35,000 <br />2.66 <br />3.99 <br />5.32 <br />6.65 <br />7.98 <br />9.31 <br />10.64 <br />11.97 <br />13.30 <br />40,000 <br />3.04 <br />4.56 <br />6.08 <br />7.60 <br />9.12 <br />10.64 <br />12.16 <br />13.68 <br />15.20 <br />45,000 <br />3.42 <br />5.13 <br />6.84 <br />8.55 <br />10.26 <br />11.97 <br />13.68 <br />15.39 <br />17.10 <br />50,000 <br />3.80 <br />5.70 <br />7.60 <br />9.50 <br />11.40 <br />13.30 <br />1 15.20 <br />17.10 <br />19.00 <br />