SeaWorld has been accused of drugging killer whales, painting over their injuries and keeping them in pools so shallow they get sunburned. A lawsuit filed by Joyce Kuhl, a grandmother from South Carolina who visited the Orlando park in 2013, claims orcas are being kept in 8ft deep holding pools, leaving the marine animals 'essentially roasting'. In her suit, Ms Kuhl alleges that the resulting burns are so bad staff are forced to paint the orcas with black zinc oxide to disguise the injuries . Scroll down for video . Accusations: A lawsuit claims the orcas at SeaWorld Orlando are being kept in shallow holding pools which give them such bad sunburns staff are forced to paint them to disguise the injuries . Ms Kuhl wants to have her $97 ticket reimbursed, as well as tickets for millions of other visitors who have been to the park in the past four years, accusing SeaWorld of 'false, misleading and deceptive business practices,' the Orlando Sentinel reports. In her suit she also alleges that the giant marine mammals are being deprived of food for days while being trained to perform at SeaWorld, and that the chlorine used in their tanks is 'many times stronger than household bleach'. Kuhl's suit details allegations of forced breeding, incestuous inbreeding and whales kept together in ways that make them hyper-aggressive so that they fight and inflict deep gashes on each other. She claims to have witnessed whales 'banging their heads against their tanks and grinding their teeth on the walls, floors and bars until their teeth break or are worn to the pulp, allegedly because of boredom, frustration and ennui,' The Guardian reports. This is the second lawsuit against SeaWorld in less than one month, with similar filed in California which accuse the company of 'misleading the public' by claiming that their killer whales are happy. The lawsuit also alleges that the giant marine mammals are being deprived of food for days while being trained to perform at SeaWorld . This follows a failed social media campaign last month, during which SeaWorld organised a Q&A on Twitter using the hashtag #AskSeaWorld. Instead of the intended questions about opening hours, animals and attractions, the company was asked if their 'tanks were filled with orca tears'. Many people used the opportunity to express their anger at the company and questioned its ethics for keeping killer whales and other animals in captivity, often in solitary confinement. User @AshleeCheese_ tweeted: 'Why do you keep breeding whales when you barely have enough room for one? #AskSeaWorld.' Another campaigner @Jennyleeisme followed suit and tweeted: 'Do you really believe Shamu Stadium is the most advanced marine mammal habitat? Have you seen the ocean? #AskSeaWorld.' Animal rights group PETA was quick to make its views known, tweeting a series of photographs of the marine creatures, reportedly showing signs of their distress. The backlash comes two years after the release of the documentary BlackFish, which questioned the conditions orcas were kept in following killer whale Tilikum's fatal attack on trainer Dawn Brancheau at SeaWorld Orlando in 2010. The 80-minute film, which premiered at Sundance in 2013, prompted questions about the ethics of keeping the large mammals in tanks. Since its release, attendance has declined at the company's parks in Orlando, San Diego, California and San Antonio, Texas. SeaWorld's stock value has also plummeted. To counter the backlash, the firm, which has participated in animal rescue programs for more than 50 years, has announced plans to nearly double the size of its orca enclosures in upcoming years. Recent figures show attendance to the company's 11 parks between October and December 2014 fell 2.2 percent to 4.4 million from 4.5 million in the same period a year ago. Attendance fell 4.3 percent during the entire year to 22.4million from 23.4million in 2013. During the fourth quarter last year, the company reported a loss of $25.4million, compared with a loss of $13million in the same period a year before.
SeaWorld Florida accused of drugging its performing killer whales .
Lawsuit alleges park's pools are so shallow the orcas get sunburned .
Accuse staff of painting over killer whales' injuries and burns .
Claims marine park use chlorine 'many times stronger than bleach'