sappersrest

The sand cleaners as sold in the west are not really suitable for sand available here unless it is a sand high in silicate, then maybe it is worth a go, but with the cost of glass media here it is not worth it. Change it

Sansai animal hospital also ask for a real time pcr test as this will indicate how serious or not the problem is.

As previously stated maintainance manegment companies have absolutly no idea about balanced water, It would seem to me that as labour is cheap here compared with the west a regout solves everything .Our 12x 25 m pool in our moobaan has similar problems lasted for 15 years then a regrout now it is part of the budget cycle cost 88k

Small iphone ipad repair shop at meechok plaza, in the  covered passage way next to Rim ping

Same row of shops as the lady who makes Indian clothes ,good service 1000 baht for Ipad battery.

Air asia are definatly flying to Phuket  from Chiang Mai depart around 1.30 pm depart Phuket 6 .35 pm  just got back .

Katathani Kata beach gets my vote.

Fortunatly for me  I have found the oposite to be true I use line to comunicate  and so far so good.

Well I managed to save an extra 3600 baht on their already discounted prices,

Win win pool shop are offering 5% discount. In addition to their already reasonable prices

A bit of a pointless question ! this is a forum for swimming pools,

A good advertorial explains this well. There is no chemistry involved just UV destroying the DNA string of bacteria and chlorine by products .

https://www.spectralightuv.com/uv-pool-results

A fullblown water softener is the only way  a filter will only filter out the big bits

Sorry to the original op for digressing. Forum member Bagwain has  vast experiance in this field and should be able to point you in the right direct , best advice is to pm him as he wont be able to tell the real truth due to defamation laws here.

Good luck with your quest.

1 hour ago, firestar said:

Agreed. I have a UV system you still need residual Chlorine as bacteria doesnt get destroyed  until it goes through the lamp and in some parts of the pool might be hours while bateria from the swimmers who just jumped in the pool also not destroyed until hours later . It is also suppose to destroy Algae but with the heat here I found it impossible to control algae with UV alone . Now I just leave it on as a secondary system to have very clean water but keep levels of chlorine as I would without

 

 

 

-----------

You are absolutly spot on must always keep a minimum of  .5ppm of free chlorine in the pool ,to prevent any cross contamination.

Another good tip is to clean the quartz glass sleeve once every 3 months or so if the pool has a lot of bathers, as body fats etc get baked on to the lamp sleeve, thus reducing the transmisity of the uv

  light most of the figures given in the blurb assumes a transmiity of 95_ 98 %. Which is difficult to achieve if the tube gets dirty.

UV a fantastic bit of kit dangerous definatly not, exspensive that is all down to a matter of choice.

As a side note chrystal clear water isa must.

Good luck with your choice I am sure it will work for you.

36 minutes ago, unheard said:

The linked paper itself is recent, and in it the author does provide references to many studies.

Some of the older specific chemistry studies are from as long back as 1965.

Apparently the author does not think that they're outdated!

But if you have links to the newest relevant studies, please share here with us.

Thanks!

See page 7 of this forum, i cannot get the links to open maybe if you contact forum admin they may get them to work ,its under the subject heading of scientific papers. Good luck if you can get them to work.

I really cant be bothered to try.

2 hours ago, unheard said:

What do you mean by "lock up"?

Do you have a link?

You can read more about chlorine and CYA in the Richard Falk's white paper: https://cdn2.hubspot.net/hubfs/3831534/Chlorine-CYA.pdf

"This is why 3 ppm FC with 30 ppm CYA is the same as 6 ppm FC with 60 ppm CYA is the same as 10 ppm FC with 100 ppm CYA.

As the CYA level climbs, the FC must also be increased proportionately in order for the hypochlorous acid concentration to remain constant."

The paper refered to is 56 years old the knowledge of pool water chemistry

has come on in leaps and bounds since the advent of new technology .

I believe you live in Chiang Mai and want to meet up for coffe or beer pm me

Not really low levels of cynuric around 30 ppm and not above 50 are really a good and effective way of making the hypochlorus acid more effective in killing bacteria algea

Unfortunatly the most sold chlorine here contains cynuric acid, this is mainly down to some unscrupulus pool companis pushing the sale of this product with absoluty know idea who what and why they are selling it ,just keep up the sales numbers

There has inyears 

Been abig dillution of the pool industry in terms of skills and knowledge it all began years ago during the first big world reccesion with landscape gardeners getting in on the act seeing it was an easy buck

Then the builders got in on the act for the same reason with no idea of pool hydraulics or chemicals

Just buying packages from equally suspect suppliers just to turn the numbers over inshort the whole industry became a mess world wide , car salesmen selling hotubs etc the industry was really destroyed and just became a game of numbers, There is a wll known company on the gold coast in oz that will sell just about any one a franchise.

In the UK there is a company tha will put people on the road after a months training.

In America they advocate high level of chlorine in case little johnny gets a rash in his neigbours pool.

If you want to swim in a relitavly

Low chlori e pool Austria

is the place to go 

Below .5 ppm free chlorine. I have attended a few international conferences on pool water treatment a nd the c

oncensus amongs delegates is about the same as i have said

If you are having

Maintenace done choose wisly the knowledge is here on this forum just ask if you dont want to get to embroiled in a disscussion please pm me

2 hours ago, Saanim said:

I did not speak about smelly chlorine, I have mentioned people and kids with problems and allergic on any level of chlorine. And such medical studies can be found when goggling. And they speak about the problems leading also to cancers. 

 

But I understand that the people from pool business do not like such mentioning. Same as they do not like mentioning of copper sulphate for algae growth killing, that would reduce their sale of chlorine and pH Minus (and the precise measurements for that) what substantiates majority of their sales. Then, they scare their audience with strange stories...

 

To kill not only the germs but also the algae it needs mostly more than 1 ppm chlorine with 24/7 maintaining the pH, especially in tropes with high temperatures and the vegetation around. In Europe they recommend up to 3 ppm, somewhere in USA up to 5 ppm - beside the regular chlorine shocks.  So well it's working for the water, but not for the swimmers.   

     

 

 

This topic is going way off course now ,I would with respect ask the op to contact the moderater to lock it from further comments

4 hours ago, Saanim said:

The chlorine vapours (heavier than air) are laying on the water surface. And when there is not much air draft around - and the water is fenced off by a risen edge at the skimmer pools - the only way to dispose the vapours is by the deep breathing of the skimmer ????. 

 

totally incorrect the chlorine smell in badly managed pools is in fact combined chlorines, if you are into google research break point chlorination.

once again in a badly managed pool  stinging eyes and a shortage of breath is down to the formation of  nitrogen tri chloride  (tear gas) a reaction of hypochlous  acid   with is actually the killing agent when chlorine is mixed with water.

use google correctly and it is all  there, most university publish research papers just need to spend a little time.

low levels of chlorine are to be highly recommend if you have the time and a good test kit 1ppm is  ok with a low ph of 7.2 is possible

4 hours ago, Saanim said:

A high level of chlorinated water is not really much healthy for a swimmer even if he/she is not suffering under asthma problems. That is proven by many medical studies (reviewed approved by peers), many can be found by googling. (Even if some are suppressed by strong pool business).  And for kids this was found much more serious.

once again  correct but studies apply to indoor pools  the conclusions in most cases were due to incorrect water balance and poor ventilation.

the main cause was a high count of THMS in the atmosphere . not really applicable to outdoor pools.

but can occur with extremely heavy bather loads in poorly managed pools.

3 hours ago, Saanim said:

In my beginning years I too have followed many advices by professionals.  Later by my own backyard experience - and by reading other sources - I found that the professionals' advices - always maximalistic - mainly lead to their increased sale, so I had downsized and simplified many of my treatment procedures.  Most of the professional pool forums are owned by pool shops, so the sale of the chemicals and additional equipment - also re-constructions - keep them alive over the years, unlike a sale of pools (how many pools do you buy in one life?).

Again correct can't disagree with that

3 hours ago, Saanim said:

I do not claim any procedure, I just describe how it works in my pool over 15 years. It's up to everybody's common sense - and his own testing - what is the best for him. 

correct

11 hours ago, Saanim said:

Am I here correct in a forum for pool problems? 

 

Or is it here to show off how many professional years some have had?

The reason why several of us have divulged the no of years in the industry is because of late there has been some terrible and in some cases downright dangerous advice given  by those who think that  they know .

Yes it is a forum for advice , and in my case is given freely without bias.

As proffesionals we are bound to give industry standard advice which is in mot cases the same the world over.

By all means if you have a pool and want advice , please post.

There is no good bacteria in a swimming pool any bacteria is bad for your pool

Bacteria is only good in a sewage works,