You may want to check the sanitizer levels of your hot tub, as this is usually the cause of mould growing on the inside. You can also buy products that remove algae/mould, such as Spa Algecide.
A hot tub is just that a tub of hot water thus, the need for a heater. To reek the benefits and pleasures of owning a hot tub a heater is an essential element to the experience.
Very young children should not be in a hot tub at all, older children can safely be in a hot tub for about 10 minutes. Make sure they drink plenty of fluids before and after going in the tub.
What Should You Do - 2003 Stuck in Hot Tub was released on: USA: 29 October 2004
Hot tub filters should be replaced annually. http://www.hottubworks.com/HotTubSpaFilters/HotTubSpaFilterReplacement.php
The temperature should NOT EXCEED 104oF.
There does not need to be a certain temperature if your hot tub will not be in use. In fact you should drain your hot tub if you wont use it for a while, so it wont be a danger to children or pets, or inclement weather.
Make sure your hot tub has onsite repair and maintanance in case of problems.
If you take proper care of your hot tub cover it should last for the life of the hot tub. For more information visit http://www.greatnorthernhottubs.com/faq.html.
Yes
Pregnant people.
Yes
It should be on a dedicated circuit and should match the rating on the tub. There will be a plate somewhere on the tub with the rated amperage.