Hot tub TDS tester
- Thread starter Farmgal
- Start date
I should clarify that I do not have salt in my hot tub but I MSP that creates high CCs. I thought using a TDS meter would let me know when its time to change the water. I have a well and can't change the water in the tub on a whim. We have a drought and don't want to run the well dry.
Taylor K-1766 Salt Test Kit
tftestkits.net
TDS is a more or less meaningless number. All it tells you is that you have *something* in your water, but not what that *something* is.
Consider one of our two recommended test kits, either of which will measure all of the parameters with which the TFP method is concerned.
Test Kits Compared
Consider one of our two recommended test kits, either of which will measure all of the parameters with which the TFP method is concerned.
Test Kits Compared
- Jun 1, 2018
- 16,114
- Pool Size
- 26000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
If u are going to continue with the Mps use you should purchase the interference reagent so u can accurately test your cc’s so when they become persistent you know to purge & refill. Or u can just stick to a purge/refill schedule of every 3-6 months. I personally do every 6 months, spring & fall, as its nice weather & doesn’t take the tub long to heat back up & enjoy 
I don’t use mps & follow the dichlor then bleach method. Haven’t had any issues with persistent cc’s on my current purge/refill schedule.
I don’t use mps & follow the dichlor then bleach method. Haven’t had any issues with persistent cc’s on my current purge/refill schedule.
For most pools or spas, salt is the primary form of TDS.
You really don't want to add anything that adds a lot of non-salt TDS.
You can get a TDS/salinity meter and there are many to choose from at different price points.
A calibration solution is always recommended.
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You can also just keep notes on what you add and then you know the TDS.
Basically, adding one pound of any solid chemical will raise the TDS by about 310 ppm.
1 ounce weight will add about 20 ppm TDS.
1 gram of product adds about 0.70 ppm TDS.
10 grams adds 7.0 ppm TDS.
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People soaking in the water adds TDS.
10 ounces of 12.5% liquid chlorine will raise the TDS by about 42 ppm.
PoolMath
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As always, lots of good info. Should I ignore what I've read on maximum TDS levels in hot tubs? I can just plan on changing my water every 6 months.
I'll check into this test. I have most of those chemicals.
It's interesting to know and somewhat helpful, but really not necessary.
Most people can get a sense of when their water needs to be replaced because it no longer seems fresh and clean even with normal chemistry.
The water can get cloudy, smelly and foamy.
More important than the TDS level is exactly what the TDS is.
You can get a buildup of certain contaminants that are difficult for chlorine to break down and they form various disinfection byproducts.
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