Back washing means that water from the system runs over the top of the sand in the sand filter to waste in order to clear it and reduce the pressure needed for the water to circulate.
backwasing is when you reverse the direction inside the filter and sends all the debris and oils caught by the sand or cartridges out a waste pipe.
is it legalel for swimming pool back wash into sewerage system
Once the pressure guage reads 10 psi above clean filter psi
the answer is subtraction
???? Refer to: Poolspa.com
To which recovery operation do you refer?
It would usually refer to a surgical procedure of some kind.
It refers to Hitler's invasion of the Soviet Union.
The term "War on Palestine" is nebulous. Does it refer to the Israeli-Palestinian Conflict as a whole? Does it refer to Operation Cast Lead? Does it refer to Operation Pillar of Smoke? Does it refer to the Separation Fence? Does it refer to the military occupation of the West Bank? Does it refer to Arab countries holing Palestinians up in refugee camps for three generations? Does it refer to Lebanese military incursions into Palestinian Refugee Camps in Lebanon? Does it refer to how Palestinian passports and visas are not seen as legitimate pieces of paper? Unless the term "War on Palestine" can be defined, we cannot begin a discussion. Additionally, the word "legitimate" is almost as nebulous as it can refer to moral right, legal right, classification procedures, and numerous other things.
The terms operating theatre and operating room refer to the same thing. Operating room is the term used in the United States, but 'theatre' is used in Britain.
Operation refers to the German invasion of the Soviet Union (USSR). It took place on 22nd June 1941 and ended just over 5 months later on December 5th 1941.
ASAI could refer to the American Society of Architectural Illustrators. It could refer to the Advertising Standards Authority for Ireland. Or it could refer to Automated Systems America, Inc., a company managing the processing and operation of Automated Teller Machines (ATMs).
The definition of apply is to spread on, bring into action, or to put into operation. Synonyms for the word apply includes relate, refer, appertain, pertain and have to do with.
The 'D' stands simply for 'Day'; The Allies could not refer to the operation as 'The Invasion of Normandy' for obvious reasons and in order to coordinate events they would simply refer to them as 'H-Hour, D-Day'
'Rolling Thunder' was an operation during Vietnam, in which a fleet of B-52's bombed an area.