"We've got to keep our doors closed, the fly nets are up so it doesn't look like we're open most of the time which is a bit of an issue."
Some residents and business owners are frustrated at what they feel is a lack of action.
"The council know but they never address it," added Garry, while dealing with the lunchtime rush at The New Cornish Arms.
"They knew it was happening last year and then all of the rest of the year, when it was cool, they didn't do anything and now the flies are back.
"I pay my business rates, which aren't cheap. I pay my council tax, which isn't cheap, and you expect a service."
Residents have also suggested the source of the flies could be the area's drains, which they claim aren't cleaned as regularly as they used to be.
Carmarthenshire council said there was no evidence to suggest drains could be the cause, and that its highway drain cleaning programme "remains on schedule".
It said it's looked in to complaints "whenever they have been received" and that it and NRW are "investigating the issue as a priority".
"We understand the concerns raised by residents and businesses in parts of Llanelli regarding increased fly activity and appreciate the frustration this is causing," said councillor Aled Vaughan Owen of Carmarthenshire council.
"We would encourage anyone experiencing issues with increased fly activity in the area to report them to us, as this information helps officers monitor the situation and target investigation activity.
"Investigations remain ongoing and it is important that any conclusions are evidence-based. However, residents can be reassured that significant officer time and resources are being devoted to this issue."

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