Advantage and disadvantages of telex
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The advantage over telegraph is that ordinary people could read the output and over the telephone that there was a written record and the recipient did not need to be present to receive a message. The disadvantages are that it is expensive and requires special phone connections.
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Advantage....
Osmotic pressure are not a factor in Ed system, so the pressure is feasible to utilised for focussing salt resolution of 20% or higher.
Disadvantage.....
Organic matter , colloids and SiO2 are not removed by ED system. Feed water pretreatment are necessary to avoid having ED stacks fouling.
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