Backwashing A Seawater Swimming Pool

by Donald

Is it possible to back wash the filters using water from mains or storage tanks instead of using pool water?



Thanks for you question Donald

I am personally not familiar with backwashing from a water storage tank, although due to my ongoing research and talking to many people in the pool business, I've heard the idea has been spreading.

I believe many good products are actually in Australia.

A filter needs alot of pressure to move the sand and DE around, especially when backwashing.

Here are some sites for you to look over:

Some people like the idea of having water storage tanks plumbed into their pools to backwash. Many have these tanks filled with rain water.

When it comes time to backwash they simply turn a couple of valves and backwash with the collected rain water instead of the pool water.

It would save on water because by doing this, you're using water that's already available instead of using pool water, then topping off the pool.

It's an interesting concept and I think it's worthy to look into.

If you have success in doing this or have any other information you can add, please feel free to contact me again.

Hope those links help and thanks for stopping by.


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Sea water Swimming Pool..Saltwater

What is the best way to keep a sea water pool.
I would like to use as little chlorine as possible. If you could advise me that would be great.

Thank you


Thanks for the question Donald

I assume your question is about salt water swimming pools, so I will point you in the right direction.

I took care of both chlorine and salt water pools in Arizona for years and have been the pool tech for the YMCA salt pool for the last 3 years.

These two pages will give you the information you need on how to take care of your salt water pool system.

Salt Water Swimming Pools..Chlorinator..Maintenance Guide

Chlorine Generator..Salt Water Swimming Pools..Salt Cells

This is all about my years in the pool business, not just from the chemical and sales side, but actually taking care of pools.

Pretty much anything you need to know about taking care of your pool can be found on this site.

And be sure to enter to win a free FAS-DPD K-2006 Taylor pool water test kit.

Swimming Pool Article Contest

Best of luck


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Sea/Salt Water In My Chlorine Pool

by Keith
(New Jersey)

Our Chlorine Pool has recently been flooded be the bay in Avalon, NJ by Hurricane Sandy. The pool is winterized and covered.

What steps need to be taken now and in the spring to prevent any issues and/or damages to the pool and filtration system?

Thank you


Thanks for the question Keith

I hope everything is alright. Everybody had been following that storm and saw the devastating effects.

Different oceans and salt water bodies have a different amount of salinity. Salinity is the amount of salt found in 1,000 grams of water. For 1 gram of salt per 1,000 grams of water, the salinity is 1 part per thousand, or 1 ppt.

The average ocean salinity is 35 ppt but can vary between 32 and 37 ppt.

Pool water salinity is measured in parts per million. The average salt swimming pool is between 2500 - 4500ppm (parts per million). As you can see the ocean has a much higher salinity than a regular salt pool. Even with the salinity of a pool being that low, it can still cause damage to the pool surface, pool decks and wood decking, and decorative rocks such as Flagstone.

Here's a post from the U.K. about ocean flooding and swimming pools:

Flooding is much more than salt water. You're also concerned with sewer waste and other contaminants such as dead and/or rotting animals.

The question doesn't say whether it's an above ground or inground pool. You're in a very precarious situation. If it's an above ground pool you'll need to drain, clean, and do a refill, but you run the risk of the vinyl liner coming apart or separating from the walls and floor.

With an inground pool you need to be concerned about the water table level. If the ground is wet, which I assume it is, and you drain the pool, you run the risk of the pool caving in on itself because the pressure on the outside of the pool is greater than the pressure on the inside of the pool. the pressure is equalized when the pool is full but not when it's empty and the water table is high.

If draining the pool is not an option right now, you can do a drain and fill at the same time. With a sand filter and most DE filters, simply turn the Multiport valve to WASTE, close the skimmer valve, and fill with a garden hose at the opposite side of the pool. With a cartridge filter you'll need to get a submersible pump. Get the salinity down as far as you can.

Regardless of how you handle this now, you're going to have some work to do. I would suggest removing as much sea water from your pool as you can as quickly as you can. A marginal amount of debris in the pool shouldn't be a concern, but alot will require vacuuming to WASTE while filling the pool.

If you would like personal assistance, I do phone consultations for a donation of your choice. It makes things go much faster. If you choose to not go that route, we can correspond by email.

Contact Me


Hope this helps and good luck with your pool.


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Sea Water Pool

by Donald Cullen

Although the pool I have is salt water, its not a pool where I have mixed salt with water.

I have taken the water from the sea. There is 180,000.00 liters of water in the pool.
Do I still treat it as if I added salt to the water.

Thank You


Thank you for clarifying that Donald

I honestly say I have never taken care of a true seawater pool, but I can give you my take on it.

Ocean water, in general, contains about 35,000ppm salt, where a normal saltwater pool is between 3000 - 4000ppm, so obviously a normal salt water chlorine generator will be out of the question. It would probably burn up within a couple of hours, maybe less.

There's other things in ocean water that you wouldn't normally find in a home salt pool.

Salt in seawater isn't just regular salt, Sodium Chloride (NaCl), you also have magnesium, sulfate, calcium, potassium and trace elements. I believe its only like 85-90% NaCl.

You might also consider the organics your going to add to the pool. Seawater is teaming with small life forms, especially near the coast regions.

You'll have to sanitize and filter it all out as well.

You'll have to get a good filtration system especially designed for seawater. You might call a cruise line because many of them have seawater pool on board the ships.

My advice would be to try to contact someone who has specialized in true seawater pools, perhaps a cruise ship company or maybe even a local or national park or some place like Sea World here in America.

This is really one area that I can say I have very limited knowledge.

When you do get your pool up and going I would like to see pictures and maybe even an article on how its working for you. That's an area of interest that I'm sure many people have.

Best of luck


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