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6. "How to Clean Your Own Pool", www.wikihow.com,29-11-2019 ,
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7. "Swimming pools - water quality", www.betterhealth.vic.gov.au,
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8. DEREK COLEMAN (6-1-2020), "Do you really know how to clean
and maintain your swimming pool?" ,www.cleanup.expert, Retrieved
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9. Kevin Woodhurst (10-2-2019), "15 Pool Maintenance Tips: How to
Keep Your Pool Clean" ,www.thespruce.com, Retrieved 8-6-2020.

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