© 2015 Delta Ultraviolet Corporation All Rights Reserved Rev 01/16 P/N 94-35234 Page 7
Pre-Installation: In order to ensure that your DELTA UV unit functions with the proper exposure time to
achieve the desired water sanitization, it is important to provide the proper water flow rate through the
DELTA UV unit. If water passes through the unit too quickly, the exposure time of the microorganisms to the
UV bulb produced rays will not be sufficient to obtain the desired disruption and eradication rate. The water
flow rate through the UV unit is governed by the piping of your pool or pond and the size and output of your
circulation pump. There also needs to be consideration to the application for the UV unit. Fish ponds have
different requirements than do swimming pools, water features, fountains, or waterfalls.
Swimming Pool Turnover Rates: Swimming pools are somewhat simpler to calculate for flow rates. Most
residential pools are designed to have the capacity of the pool turned over every
12 hours. Semi-commercial pools are normally designed for an 8 hour turnover flow rate. Check with your local
jurisdiction for the required flow rate for your type of pool to be sure. Thus, as an example, using the same
formula as above, a 20,000 gallon residential pool will need to have a pump capable of a 28 GPM flow rate and
a 25,000 gallon Semi-commercial pool will need to have a pump capable of 52 GPM.
Like pools and ponds, the DELTA UV unit needs to be properly sized by flow rate. Moving the water through
the DELTA UV unit’s wet chamber too fast will not allow enough exposure time of the water to be exposed to
the UV bulb rays for the required exposure time. The chart shown on page 3 depicts the desired and
maximum flow rates for your DELTA UV unit. Make sure the flow rate of your circulation system pump does
not exceed the maximum allowable flow rate of the UV rating if you are in doubt). If the pump output
exceeds the maximum flow rate of the DELTA UV unit you have selected. (Consult your supplier or pump
manufacturer for the pump’s GPM rating if you are in doubt). If the pump output exceeds the maximum flow
rate of the DELTA UV unit you have selected, select a DELTA UV model with a higher flow rate capacity
rating or consider a multiple unit installation.
To Next Page
Loading...
