Posts Tagged ‘pool maintenance’

Swimming pool sandfilter operation | What is the Multi-port valve?

Published by Admin on July 15th, 2011

The selector options on MPV (Multi-port valve) of a swimming pool’s sandfilter explained

The multiport valve is the main flow control valve on a swimming pool sandfilter, the most used filtration system in South Africa. The MPV has 6 settings to direct the flow of water from the swimming pool through the pump and filter.

 

Aquaswim swimming pool sandfilter

 

 

 

 

 

 

 

 

 

The MPV settings and their function are as follow:

  1. Filter
    The normal setting for the valve. Pool water is drawn through the pump, passed into the top of the filter tank and down through the filter media, via the filter underdrain system, after which it is returned to the swimming pool.
  2. Backwash
    The setting used for flushing (more…)

How to acidwash a pool

Published by Swimming-Pool-Expert on June 24th, 2011

Acid Washing

You will have to drain and clean your pool before you start. An acid wash becomes necessary if the pool has turned into a swamp. This may occur if the pool has been stagnant for a period of time so that algae has taken over.

The general rule of thumb for determining the need for an acid wash is: if you can see the bottom of the pool (the floor) then you can bring it back with chemicals, labour and filtering. If the floor is not visible, the cost of the chemicals and labour will generally be greater than the acid wash charge, and take much longer. Also, extensive algae blooms will stain plastered pools, making an acid wash desirable and if there are any other stains maybe from metals.

An pool acid wash is, put simply, purposeful stripping of a tiny layer of liner, exposing fresh plaster beneath. Therefore, it is not advised to make it an annual custom, which will accelerate the need for re-plastering. Most plaster coats (sometimes called marble plaster or marblite) are in excess of 8mm, so a few careful acid washes should not hurt.

You may also decide on an acid wash not because of swamp conditions, but just to bring out a brighter, whiter finish. Mineral stains caused by excessive (more…)