how to lower if I need to? alkalinity of 170

[timmie]

Hi, I went to get my water tested and these are the results.

Chlorine 8 I have been putting pucks in, two large into the skimmer
PH 7.1 just added 1/4 box borax got that info on line here for my 70,000 litre pool
Calcium 100
ALkalinity 170

Can I still swim with these numbers? how do I lower the alkaline? and how much would I use? Could I buy it at Canadian Tire, or a home hardware store,,,,,,,,whatever I need. I have a vinyl pool............
Thanks again everyone.

[mas985]

To lower alkalinity:
http://www.poolforum.com/pf2/showthread.php?t=191

You did not post CC or CYA but from what you have given, it does not look like anything is at a dangerous level. Why did you think you could not swim?

[timmie]

I thought once it reaches a certain level that you cant swim ( alkaline)

[timmie]

I forgot to mention that my PH is o.k, its the alkalinity that I am worried about..................I dont understand the thread that you sent me. I did have my solar cover on for a few days , could that have changed the alkaline? Do I need to use the acid to bring it down abit? Or can I just add more water to my pool? We had quite a bit of rain in the past few days...

[let_her_flicker]

You want to read this thread:

http://www.poolforum.com/pf2/showthread.php?t=195

Personally, I wouldn't worry about an Alkalinity reading of 170, as long as your PH is not bouncing around. When you read the information, Ben says "around" when he mentions the numbers.

Pool is okay to swim in.

[mas985]

Timmie,

First alkalinity of 170 is a bit high for pool water but my house is over 240 so it is safe to swim in.

Next, in your original post, you asked how to reduce alkalinity which is why I gave the link I did. Did you not understand the procedure or were you looking for something else?

[CarlD]

I have to disagree. For an ordinary vinyl pool, a T/A of 170 is nothing to worry about and nothing to lower. Not until you hit 200 do you have a problem, so I like to limit the safe range to 180.

Don't bother lowering it. Don't be afraid to swim in T/A of 170.

[mas985]

Sorry Carl, I guess I assumed too much. Although he did not say he had a heater, according to Ben:


What should my TA be?
Somewhere between 50 and 200 ppm. If you've got a heater, it usually should be lower than 150 ppm. If you've got a plaster or concrete based pool, it usually should be higher than 80 ppm.


Because I have a plaster pool and high calcium, I like to keep mine between 80-120.

[timmie]

Hi, the "he" is actually a "she". Just to clarify, my heater doesnt work so I dont think it has anything to do with that. I also did not understand the link that I was sent here to look it. Its too technical for me? Is it the rainwater that raises the alkaline??

[medvampire]

Timmie
There can be several causes of a high ALK. I have you tested your fill water ???
Put simply ALK is the restance to ph change present in a body of water. The higher the ALK the harder for change to occur. The restance to ph change is a good thing but like fatty foods too much is bad. High ALK can cause mineral deposits to build like the cholesterol from the fries I had for lunch plugging my arties are like the deposits that may form in your pool heater or on other surfaces. As for taking a swim it shouldn’t hurt you my pool is around 190 right now. To get a great answer the pros here they need more info. You might also want a good test kit. Ben kits are the best from what I have seen.
http://www.poolsolutions.com/cart/shopping.php

Pool size – Given
Free Chlorine
Total Chlorine
PH
ALH
CYA
Total or calcium hardness
Pool surface
Heater and type

Later
Steve