My current hypothesis is that the chloride in the solution is interfering somehow with the API test chemical reaction.
Most other ammonia sources (e.g. cleaners) are ammonium hydroxide so they don't interfere with the test reagents in the same way.
The information I got from API (quoted 3 posts up) told me that chlorine is used in the API bottles as part of the chemical reaction, so perhaps the presence of chloride ions in the tank is messing up the test reaction? I'm afraid my chemistry is not quite up to scratch for this, I was hoping a chemist could look at this and spot what was going on
Most other ammonia sources (e.g. cleaners) are ammonium hydroxide so they don't interfere with the test reagents in the same way.
The information I got from API (quoted 3 posts up) told me that chlorine is used in the API bottles as part of the chemical reaction, so perhaps the presence of chloride ions in the tank is messing up the test reaction? I'm afraid my chemistry is not quite up to scratch for this, I was hoping a chemist could look at this and spot what was going on