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To evaluate backwash performance, it was necessary to dirty the filter bed of the analyzed filters (F1, F2 and F3) by applying four filtration rates (TF20-20 [m.sup.3] [m.sup.-2] [h.sup.-1], TF40-40 [m.sup.3] [m.sup.-2] [h.sup.-1], TF60-60 [m.sup.3] [m.sup.-2] [h.sup.-1] and TF75-75 [m.sup.3] [m.sup.-2] [h.sup.-1]) in three silica sand granulometries (G1, G2 and G3), with a 4-h filtration in each experimental combination.
Third, pool operators were asked to estimate the number of swimmers in the past week and number of days since last filter backwash; however, the data were deemed unreliable and thus could not be used to characterize the relationship between either of these factors and the detection of microbes in filter backwash samples.
1), two polishing wetland systems referred to as East and West were designed in about 12.46 ha to reclaim backwash water from the City of Tucson Reclamation Plant.
This study is limited by having a small sample size, by being a convenience sample, and by using backwash collected from pools with a single filter medium (i.e., sand) exclusively.
Once you've confirmed that the vessel is leaking and the answer isn't as easy as a cracked skimmer or fixing a backwash seal, you'll need to call in a leak expert.
The first of the units has been in operation for two years and has not required any maintenance attention other than normal daily checklist monitoring of the system's controller, which displays the number of backwash cycles performed.
Most people call that backwash undertow, but that's actually incorrect.
variabilis usually occurs in the backwash rather than the swash, presumably because flow in the swash is too turbulent.
The backwash of stomach contents, known as reflux, irritates the lining of esophagus and causes heartburn.
Lost in the media backwash over the FBI's stakeout of the Committee in Solidarity with the People of El Salvador (CISPES) were several incidents showing bureau officials ready and willing to photocopy and pass along unsolicited rightwing manuscripts.
the construction and property operation intends in the military property, Luftwaffe barracks cologne-wahn, The connection of the existing backwash filters and water meters to the power grid and the building management system.