General Pool/Spa

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	How do you install a hydrostatic plug?
	What colors are available?
	How many main drains do I need?
	What is an anti-vortex cover?
	Why do I have multiple main drains?

How do you install a hydrostatic plug?

• A hydrostatic plug or valve is placed at the bottom of an inground pool. Its purpose is to open when excessive ground water pressure builds up allowing the ground water into the pool. These valves are most important during construction or when the pool needs to be drained. While the pool is empty, there is nothing weighing the pool down. It is at this time the pool vessel is most vulnerable. Without a hydrostatic valve, high ground water pressure could lift the pool out of the ground.
• The hydrostatic plug is installed upon installation of the pool, or when renovation work is being done. It is secured into one of the main drain ports. A pebble tube is required to prevent the hydrostatic valve from clogging.
  

What colors are available?

• Hayward manufactures main drain covers, skimmer faceplates, return fittings and eyeballs in grey, black or white. All dealers may not stock the full range of colors manufactured by Hayward and a special order may be required. 
  

How many main drains do I need?

• This depends on the flow requirement of the pool or spa and its fittings and features. There are no drawbacks for more than one main drain. Two or more are recommended so that the suction at the bottom of the pool/spa is divided. Some local codes require slower moving water through the plumbing system, so additional main drains may need to be added to meet local building codes.
  

What is an anti-vortex cover?

• A plate or cover that is affixed to a suction inlet of a swimming pool or spa to prevent a vortex (water moving too fast) from forming as water passes through its circulation pump. It is a safety precaution to help prevent entrapment.
  

Why do I have multiple main drains?

• Additional main drains are used to supply water to water-features.
• Meet building codes for water velocity.