Changing from Sodium Hypochlorite to Chlorine Dioxide

Appreciate your view and comment based on your experience after changing from sodium hypochlorite to chlorine dioxide as oxidizing biocide in cooling water treatment program.

My concerns as follows:-

1. The current issue is mainly on the reaction of sodium hypochlorite with ammonia and caused the sodium hypo strength become lesser and required additional consumption. At the same time, it will create another issue in term of high chloride in cooling water and potential of stress corrosion cracking at the stainless steel cooling water heat exchangers.

2. Another concern in term of algae formation at the cooling tower wall. Is chlorine dioxide able to resolve or need to injection other chemical as back up?

3. Loose of chlorine dioxide via evaporation process and required huge consumption  

your experience much appreciated