The second dose of MMR may be given as early as 4 weeks after the first dose, and be counted as a valid dose if both doses were given after the first birthday. The second dose is not a booster, but rather it is intended to produce immunity in the small number of people who fail to respond to the first dose.o. A measles-containing vaccine administered before the first birthday should not be counted as part of the series. MMR should be repeated when the child is age 12 through 15 months (12 months if the child remains in an area where disease risk is high).
Chlorine tastes and odors are removed. Sediment down to 30 microns in size is also removed by mechanical filtration. The filter is kept clean with a weekly automatic backwash. During the backwash (which typically occurs in the middle of the night) the carbon is washed clean by a 6 to 8 minute backwash and 4 to 6 minute rinse cycle. q. What maintenance is required with these backwashing filters?
If you are using a separation tank for backwashing, or a separate tank that separates the DE from the waste water, and returns clean water to the pool (prevents water wasting) - it is especially recommended to bump the filter as described above, and run your backwash cycle for a longer time period, maybe 10 minutes.hen backwashing a D.E. filter, bump the filter several times. That is, backwash until water runs clear, move the multiport valve to FILTER and run it on filter for a 5 - 10 seconds, and backwash again until it runs clear, etc...do this 2 - 4 times.