How to remove, install, change the gasket of a Roca Plus toilet cistern flush mechanism

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How to remove, install, change the gasket of a Roca Plus toilet cistern flush mechanism

A toilet[n 1] is a piece of sanitary hardware that collects human urine and feces, and sometimes toilet paper, usually for disposal. Flush toilets use water, while dry or non-flush toilets do not. They can be designed for a sitting position popular in Europe and North America with a toilet seat, with additional considerations for those with disabilities, or for a squatting posture more popular in Asia, known as a squat toilet. In urban areas, flush toilets are usually connected to a sewer system; in isolated areas, to a septic tank. The waste is known as blackwater and the combined effluent, including other sources, is sewage. Dry toilets are connected to a pit, removable container, composting chamber, or other storage and treatment device, including urine diversion with a urine-diverting toilet.

The technology used for modern toilets varies. Toilets are commonly made of ceramic (porcelain), concrete, plastic, or wood. Newer toilet technologies include dual flushing, low flushing, toilet seat warming, self-cleaning, female urinals and waterless urinals. Japan is known for its toilet technology. Airplane toilets are specially designed to operate in the air. The need to maintain anal hygiene post-defecation is universally recognized and toilet paper (often held by a toilet roll holder), which may also be used to wipe the vulva after urination, is widely used (as well as bidets).

In private homes, depending on the region and style, the toilet may exist in the same bathroom as the sink, bathtub, and shower. Another option is to have one room for body washing (also called "bathroom") and a separate one for the toilet and handwashing sink (toilet room). Public toilets (restrooms) consist of one or more toilets (and commonly single urinals or trough urinals) which are available for use by the general public. Products like urinal blocks and toilet blocks help maintain the smell and cleanliness of toilets. Toilet seat covers are sometimes used. Portable toilets (frequently chemical "porta johns") may be brought in for large and temporary gatherings.

Historically, sanitation has been a concern from the earliest stages of human settlements. However, many poor households in developing countries use very basic, and often unhygienic, toilets – and nearly one billion people have no access to a toilet at all; they must openly defecate and urinate.[1] These issues can lead to the spread of diseases transmitted via the fecal-oral route, or the transmission of waterborne diseases such as cholera and dysentery. Therefore, the United Nations Sustainable Development Goal 6 wants to "achieve access to adequate and equitable sanitation and hygiene for all and end open defecation".[2]

Overview
The number of different types of toilets used worldwide is large,[3][4] but can be grouped by:

Having water (which seals in odor) or not (which usually relates to e.g. flush toilet versus dry toilet)
Being used in a sitting or squatting position (sitting toilet versus squat toilet)
Being located in the private household or in public (toilet room versus public toilet)
Toilets can be designed to be used either in a sitting or in a squatting posture. Each type has its benefits. The "sitting toilet", however, is essential for those who are movement impaired. Sitting toilets are often referred to as "western-style toilets".[5] Sitting toilets are more convenient than squat toilets for people with disabilities and the elderly.

People use different toilet types based on the country that they are in. In developing countries, access to toilets is also related to people's socio-economic status. Poor people in low-income countries often have no toilets at all and resort to open defecation instead. This is part of the sanitation crisis which international initiatives (such as World Toilet Day) draw attention to.[6]

With water
Flush toilet
Main article: Flush toilet

Flush toilet bowl
Duration: 8 seconds.0:08
Toilet flush sound
A typical flush toilet is a ceramic bowl (pan) connected on the "up" side to a cistern (tank) that enables rapid filling with water, and on the "down" side to a drain pipe that removes the effluent. When a toilet is flushed, the sewage should flow into a septic tank or into a system connected to a sewage treatment plant. However, in many developing countries, this treatment step does not take place.

The water in the toilet bowl is connected to a pipe shaped like an upside-down U. One side of the U channel is arranged as a siphon tube longer than the water in the bowl is high. The siphon tube connects to the drain. The bottom of the drain pipe limits the height of the water in the bowl before it flows down the drain. The water in the bowl acts as a barrier to sewer gas entering the building. Sewer gas escapes through a vent pipe attached to the sewer line.