Maintenance and Control : 

The volume of the solution should be maintained regularly by the addition of water. It is recommended that automatic level controllers are fitted to the tank to ensure constant solution concentration and protect heaters.

The solution should be analysed regularly and replenished as necessary. See the anlysis procudure as below. The solution should be discarded and a fresh one made-up when the solution is so loaded with absorbed soils that replenishment has no effect on cleaning time.

Analysis Method 

Reagents : 

1N hydrochloric acid
Methyl red indicator (dissolve 0.04 g in 100 ml of 20% methanol).

Method : 

1. Pipette a 25.0ml sample of cooled working solution into a 250ml conical flask.
2. Dilute to 100ml with de-ionised water and add 2-3 drops of methyl red indicator.
3. Titrate with 1N hydrochloric acid to a red end point.
4. Record titre = T mls.

Calculation :

T x 3.65 = g/L Soak Clean Emulsifier PWD

Replenishment

For every 1g/L required add 1g/L Soak Clean Emulsifier PWD

Disposal  : Dispose of in accordance with local authority requirements.