THE 'UK's no1 indoor tropical theme park' has been renovated with a new £250k playground - after families blasted the "filthy" pool.
Waterworld, in Stoke-on-Trent, received more than a thousand 'poor' or 'terrible' reviews on TripAdvisor in January and owner Mo Chaudry lashed out at the negative comments.
Mr Chaudry claimed the customer is not always right after his pool was blasted by angry families.
The water park was also evacuated last year after swimmers were struck down by a mystery illness.
Since then, the owner has installed new pool water treatment systems and is opening a £250,000 immersive play village.
A spokesperson for the water park said: "Waterworld Leisure Resort is constantly investing in improving and upgrading its facilities – and this year is no different.
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"For 2023 we have installed new state-of-the-art ultraviolet pool water treatment systems as part of a six-figure investment . . . and are about to open a new £250,000 immersive play village, themed around some of Staffordshire’s best known leisure attractions.
"Waterworld Leisure Resort has invested more than £12 million on a host of new developments over the past few years."
But the 'UK’s No.1 tropical indoor aqua park' has still received numerous one star reviews on the travel advice website since May.
Online complaints have continued to centre around hygiene issues and also parents paying the full admission if using the viewing area or cafe.
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One user commented in May: "Absolutely filthy and disgusting place! Never will I go there again and we left as my kids didn't enjoy the over crowded pool and 20% of adults fully clothed entering the water.
"Not even speaking about hygiene or the filthy toilets. Absolutely rank."
In the same month, another said: "Visited twice. Our children really enjoyed the slides and pool. The only reason for two stars is food.
"The lady, who was serving food, had such long nails and no gloves, touching waffles with her fingers. What about hygiene?
"When we wanted to order ice cream, there were two ladies. And when I tried to order they both pretended they were busy cleaning worktops, just turning their backs to us."
A third remarked in June: "For my daughter's birthday we booked for her and three friends.
"Upon arrival and booking in myself and my partner we were told that to go into the viewing area/cafe we would have to pay the full admission price!
"Not a problem paying something but £23 each. Kopi luwak coffee apparently."
A final person wrote this month: "My boys had won free tickets so I said they could take a friend and I would watch.
"Turned up and asked to sit in the cafe area. I was told I would have to pay full price (£23) to sit in a cafe and drink coffee.
"I opted to sit in the desert bar as I think it is daylight robbery to pay that much to sit down and drink a coffee (obviously the price of coffee on top too).
"Mr Mo Chaudry - you really know how to make your swimming clients feel welcome. I will not be returning anytime soon!"
Wayne Goodall, Waterworld's compliance director, added: "This is a fantastic addition to our already mammoth pool water treatment system.
"The UV systems will further ensure that we have crystal-clear, safe swimming pool water for our customers to enjoy for years to come.
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"It is important that we also continue to invest in the 'unseen' bits that make it all run smoothly.
"Health and Safety is of paramount importance to us and we are confident that the UV systems will be highly beneficial, particularly at peak times."