EVERYTHING you NEED to know for your first SWIMMING POOL

Any thing to do with swimming pools, fish ponds, or other man made structures which hold water (but not wells for drinking water).

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Re: EVERYTHING you NEED to know for your first SWIMMING POOL

Postby BKKBILL » Wed Feb 27, 2013 9:53 am

This might help you visualize a simple layout. It came from

http://www.mermade.com/surge/Typical%20Layouts.htm
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Re: EVERYTHING you NEED to know for your first SWIMMING POOL

Postby jazzman » Wed Feb 27, 2013 11:23 am

In the balance tank there will be a supply of mains water to keep the balance tank topped up in order to keep the pool topped up automatically from loss through evaporation etc. The mains water feed in the balance tank will have a float valve (like one in a toilet cistern), and an overflow because during the rainy season the excess water has to be taken away somewhere. In a normal pumping situation, you will adjust the ball vales (taps/faucets) to be drawing about 90% from the tank and about 10% from the maindrain(s).

When purchasing maindrains, go for the 9 x 9" rectangular covers that fit over a square hole you make in the floor. Check out the prices on the Internet because the same model of maindrain retails here in Thailand between Baht 1,300 and 4,000.
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Re: EVERYTHING you NEED to know for your first SWIMMING POOL

Postby scudman » Wed Feb 27, 2013 9:53 pm

OK. I think I understand now. I drew this piping diagram up today for reference. I did not bother putting in the Ball Valves or Flow Meters yet. Wanted to make sure I have the basic schematic correct first. From my reading and this forums input, it seems the main drain(s) can go into the Balance tank or direct to the pump. Is one method more advantageous than the other?
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Re: EVERYTHING you NEED to know for your first SWIMMING POOL

Postby jazzman » Thu Feb 28, 2013 1:16 am

Almost right. The multi port valve usually sits on the filter unit. Depending on th brand, MPVs generally have up tp 6 positions. the most important of these are filtration, backwash, and rinse. Backwash and rinse must always be plumbed to the sewer, never back to the pool, although I once saw a pool constructed like this and the owner could not figure out why the water was always dirty.

I'm not familiar at all with the drawings on the site BKK linked to, and frankly cannt see how it wouod work effectively.

Underground pump houses are a must to avoid whenever possible - sooner or later they will flood and wreck all the equipment.
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Cavitation

Postby jazzman » Sun Apr 07, 2013 11:35 pm

Someone mentioned cavitation on another thread about pumps recently, so I thought I ought to mention that to have a well-developed flow pattern, pumps should ideally have about 10 diameters of straight pipe run upstream of the pump inlet flange or union. Unfortunately, in swimming pool pump houses, we often have to contend with space and equipment layout constraints and hence cannot comply with this recommendation. Instead, it is common to use an elbow close-coupled to the pump suction which creates a poorly developed flow pattern at the pump suction. Often the intermediate space provided by the pre-filter pot and basket will avoid this effect, but not always. I've seen cavitation damaged and pitted impellers on pumps that have been in service for a very long time. On the suction side, 90° elbows are best avoided by using large radius bends, but they are not always easy to obtain.
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PRICES

Postby jazzman » Sat Mar 01, 2014 3:00 pm

Time flies and I see almost another year has gone by since I last added to this thread.
Some of it is getting outdated but I still recommend reading it from the very beginning.
So it's time for a new word about prices.

There is currently a price war going on in Thailand over filters, pumps, and chemicals - especially chlorine. A couple of years ago, one firm started an excellent online store with products at reasonable average prices. Others began to join the bandwaggon - in fact one store blatantly copied that site completely with its design and content. Some great offers can be obtained online, but the caveat is to be aware of which sites can offer genuine online order processing, secure payments, rapid delivery, and customer and product support - price is not everything in this business.

There are also back street - or even high street - shops that have no idea what they are selling. One customer walked into a store in Udon Thani recently asking for pH Minus and although he insisted he knew what he wanted, the girls in the shop were determined to sell him pH Plus!

Gallon (3.78 litre) bottles of clarifier, algicide, and cleaning fluid are expensive. It's basically all the same stuff, but the cheaper it is, the more likely it is to be watered down - at the end of the day, using the cheaper brands just means you need to use more of it. If you have a smallish pool and the water goes very green, remember that it's often much cheaper to simply change the water than to throw a couple of baht 1,400 bottles of clarifier & algicide into it. Preventative maintenance however, is always better than cure.

Always bear in mind that it pays to shop around; I have seen the same high quality saltwater chlorinators on sale for as little as Baht 40,000.00 to as much as Baht 110,00.00 (Phuket); avoid chlorinators from China that are sold in hardare stores for around Baht 12,000, they will break down, and there is no guarantee support in spite of what the vendor claims.

The same special TRS Pool salt (in the BLUE bag) from baht 150.00 to baht 750.00 (Khon Kaen) per 25 Kg bag. 5 Kg plastic tubs of pH Minus retail from Baht 450 to 990.

Digital pH and salinity meters are now all the rage - beware of very cheap ones, you will throw them away after a few months. Go for quality ones with a genuine manufacturer's warranty that will be honoured here in Thailand. And there is no difference in quality of the traditional pH & Cl test kits in the little blue boxes that sell from 199 to 750 baht (or more).

For those of us who live in Isan, I hear that the region is shortly to get its first real pool centre with warehouse, showroom, and demo pool. Might be worth a visit - let's keep our eyes and ears open.

We obviously can't tell you on this site where to buy pool stuff, but do shop around, and if you need product or technical advice, we are always around.
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Re: EVERYTHING you NEED to know for your first SWIMMING POOL

Postby jazzman » Sun Sep 17, 2017 2:35 am

Just bumping this thread because a lot of people are sending me PM about pools and the answers are all in the thread.
Please don't PM me for recommendations for dealers and/or constructors - please do that homework yourself by surfing the web.

Two things to bear in mind:
Low prices may mean the retailer/constructor is not going to provide a reasonable after-sales service or guarantee support
High prices do not always mean better quality products or service, they often mean the retailer has a greedy profit margin.
How to build a $20,000 / £14,000 house and a $???? MOTEL Updated 21 March 09 - with BOQ and costs
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Re: EVERYTHING you NEED to know for your first SWIMMING POOL

Postby Klondyke » Sun Sep 17, 2017 9:26 am

Often we are hearing complains on cheap Chinese (and of others) things. And everybody, I think, can confirm that from his own experience. Mainly, it applies for general tools we use in house and garden.

However, sometimes our disappointment occurs also at things of rather renowned names. Either they are of the same lousy quality (relying on their name) or they have originated also from a cheap manufacturer in a cheap (perhaps Asia) country, it is just not very apparent from the visible labels. We have to be aware of the huge supply by ships with thousands of containers arriving daily to ports of US, EU, AUS. What they are bringing in?
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Re: EVERYTHING you NEED to know for your first SWIMMING POOL

Postby jazzman » Sun Sep 17, 2017 1:00 pm

Well, any pool equipment from GH needs to be avoided for starters. Did you ever try getting a guarantee on anything from there?
Some of the owners of smaller pool shops bring their stock back from abroad in their check-in baggage. No guarantee on those products either.
How to build a $20,000 / £14,000 house and a $???? MOTEL Updated 21 March 09 - with BOQ and costs
Don't let this happen in YOUR house.
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Re: EVERYTHING you NEED to know for your first SWIMMING POOL

Postby Klondyke » Sun Sep 17, 2017 2:36 pm

jazzman wrote:Well, any pool equipment from GH needs to be avoided for starters. Did you ever try getting a guarantee on anything from there?
Some of the owners of smaller pool shops bring their stock back from abroad in their check-in baggage. No guarantee on those products either.


Well, as I have showed in my thread of affordable pool, from GH I have their swimming pool filter. And after I had run with it for few years without any problem, some time later I had needed to get one more filter for my "ingenious" water treatment, described in viewtopic.php?f=14&t=4611 . So I bought another same piece in GH (7,500 Baht) - since well-proven - and installed it as the first filter after sedimentation tank, suitable for regular backwashing (by the same water 3m higher after sedimentation).

The filters are sold empty. The sand I am buying at village people washing river sand, selling it in bags sorted by its size, started from some 0.7mm. There is not much chance at such filter that something goes wrong once the sand is carefully filled in, not to break the intake pipes at the bottom. In Internet pool blogs - I mentioned in other thread - I had often read about problems when sand has been found at pool bottom, caused by a wrong function of filter - bought not in GH.

Image


Beside PVC piping and fitting I bought in GH a telescopic pipe for bottom sucking, brush and the sucking head. Also my first 1 - 2 flexible hoses for sucking, that however had not lasted long. Having now one from my pump supplier (not a pool specialist), much more expensive, however, no problem over last 5 years, even when exposed to sunshine, always stashed in OF channel.

Speaking about guarantee, the a.m. pump supplier had recognized my claim at my first pump (7,500 Baht) within 2 months. The plastic body around one bolt showed a thin crack, it has been exchanged free of charge. Although I haven't been entirely innocent - changing sometimes the flow at the 6-way valve during pump run, perhaps it was the cause. Now I am always interrupting the pump when actuating the filter valve.
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