Pdz = zeolite in the uk.
The only seller I’ve ever found was on
eBay & it failed to arrived repeatedly - & turned into one of “those”
ebay situations which became a boatload of grief all around - so I can’t comment on whether it works - but it technically should reduce odour if you can get hold of it.
Fermented feed works for us too - you can ferment any feed. & it’s as simple or as complex as you want to make it! We add water to the next dry feed & cover it & about 12 hours later its ready- feed it & leave a smidge in the bottom of the tub to start the next batch - refill with dry feed, add water, cover, rest - then feed & repeat.
But... it has also been really good year for flies - only you can probably judge whether your chickens & housing are contributing unnecessarily. Are you on good terms with any of your other neighbours? - could you ask them to be honest with you & ask them how they feel about whether your chickens cause any issues for them? Eg. cockerels, or disposing of soiled bedding ect...
If you feel your neighbour is acting unjustly, even if she does have an issue she should not be abusive towards you. Perhaps having a chat with the police might help, start recording incidents? Be prepared for a visit from environmental health if she really does decide to declare war on your chicken keeping. Been here a few years ago at a previous house & it is stressful. We had many visits from environmental health who were very reasonable - it was actually a relief to hear that they judged our hens & their habitat in no way anti-social or problematic. If you are confident all is as well as it could be & you can always jump the gun on your neighbour & contact environmental health yourself? Being proactive & keeping calm taking a reasonable approach might help to nip things in the bud? That can be harder to do if you are also getting upset and stressed and not sleeping.
You’ll have to decide if you have an unreasonable neighbour or a hen problem. No idea what your local waste management situation is - but in my experience fortnightly bin collections ect promote more maggots & flies than a few garden hens ever could!