sappersrest

Thai met dept has some good charts .

Metars and tafs from chiang mai airport.

Wundeground has some good local surface recordings and uptodate info.

Buy a surface weather station great fun

What does it say please.

Does anyone know what the old rivermarket  next to the iron bridge is going to be? A lot of work going on there.

It sounds very likely that you may have an intermtent fault with an electronic relay on the circuit board of the chlorinator. Ie the one that controls the pump switcing.

Without a circuit diagram of the board in the chlorinator and info on the control panel, its all pretty much down to drawing assumptions.

Did you ever serve in the forces?

I have stayed  at this hotel a couple of times this year they do have trained life guards on the beach . There are plenty of notices  advising  people not to swim when the red flags are flying.

Also plenty of information in the guest rooms about the dangers

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.