Draining Water From Swimming Pool

by J.P.
(Stockton, Ca.)

Leslie Pools say I need to drain 1/2 the water out of the swimming pool and replace with fresh water.

Can I drain by using backwash value next to filter, or must I rent submersible pump to pump the water out.

If I use the backwash value, do I run the pump?

Thanks for your question J.P.

My first question would be why did they say to drain the water from the swimming pool? Are the TDS (Total Dissolved Solids) too high?

Is the cyanuric acid too high?

Adjust Your Swimming Pool Chlorine

Is your water less than 3 - 4 years old?

If they just said, "It's time to drain 1/2 the water" I'd be a little concerned.

The answer to your question is yes you can use the pool filter pump to drain the water but there are a couple of things to keep in mind.

1. You need to drain on the WASTE position, NOT the BACKWASH position.

If you have a swimming pool sand filter and use the BACKWASH position you might end up losing sand in the process of draining.

2. CLOSE the skimmer valve so the filtration system is not pulling in air when the water level gets below the skimmer.

At the YMCA pool I drain the pool at the WASTE position but when I drained residential pools I always used a submersible pump.

It was a personal choice because I didn't want to put any excess pressure on the pool pump while draining the pool. This was just a safeguard for my customers, and myself.

If you're more comfortable using a submersible pool pump then I would advise you to get one.

Hope this is helpful


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Why & When Do I Need To Drain My Swimming Pool

by Knut Borgen

Is it true that there is a definite life expectancy time for water in a pool, even if rain and topping up due to evaporation takes place on a continuous basis.

Some people have told me max 5 years.

Thanks for your question Knut

The life expectancy of pool water depends on a variety of factors:

Use of pool
Type of water (well, tap, pool water delivery)
Hardness of the water
Total Dissolved Solids (TDS)
How well you take care of the chemicals; i.e. excessive use of chlorine, muriatic acid, algaecides, etc...

So the real issue is when to drain and re-fill the pool. The measurement of TDS in pool water can be influenced by many factors; the chemicals we add to adjust the pH, chlorine, water hardness, alkalinity, dust, dirt, human waste, will increase the level.

The maximum acceptable level for TDS is 1,500ppm. If you allow the pool to get above this you run the risk of staining, the water might become cloudy, and it will reduce the effectiveness of the other chemicals.

You can have your pool water tested for TDS at a local pool store. If it's close to 1,500ppm, then it might be time for a drain and re-fill.

So TDS is the answer to your question. Drain and re-fill when the TDS reaches, or is close, to that level. You want to drain because the pool requires it, not because it's the last Saturday of September 2010.


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