Reverse osmosis membrane chemical cleaning

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It depends whether ".....to keep the dissolved foulant in its state in an alkaline solution all through out the circulation period..." is required!

Without this agent, would the cleaning procedure still work out with only the main cleaning reagent such as citric acid and ammonium hydroxide? Or can we utilize any other chemical such as an organic phosphonate in lieu of EDTA to be added to the main cleaning solution ...

EDTA is a powerful chelating agent used for dissolving otherwise insoluble multiply-charged metal cations. If you omit it from the cleaning process, you will most likely have trouble removing much of the inorganic scale (generally composed of carbonates and oxides of +2 and +3 metal ions). But you should definitely check with reverse osmosis experts and with the membrane manufacturers. Although I am a chemist, I have no direct experience with this technology.