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Started By
Message
Saltwater pool - Calcium Hardness high
Posted on 4/14/26 at 6:37 am
Posted on 4/14/26 at 6:37 am
My calcium hardness has been high on my pool for a year and a half. Family is leaving for a week this week and I'm going to replace some of the water to try and get it down. Have any of you ever done this successfully? My pool is 7500 gallons and I'm trying to figure out exactly how much water to drain before I refill and then balance the chemicals again. My phosphates are also high and my salt is a little high because of my dumb arse putting too much in there.
My latest water test was Monday
Saltwater 7500 gal rectangular pool with 7x7 spa
Jandy equipment throughout with heater
Last testing was Monday by local pool store.
FC - 8.8
CYA - 80
PH - 8.1
Alkalinity - 94
Phosphates - 920
C. Hardness - 720
Salt - 3910
I also asked this question over on trouble free pool site but for some reason every time I ask a question over there I get 1000 answers and comments that have nothing to do with the original question. Or they basically tell me to search on Google and do some reading. Lol
My latest water test was Monday
Saltwater 7500 gal rectangular pool with 7x7 spa
Jandy equipment throughout with heater
Last testing was Monday by local pool store.
FC - 8.8
CYA - 80
PH - 8.1
Alkalinity - 94
Phosphates - 920
C. Hardness - 720
Salt - 3910
I also asked this question over on trouble free pool site but for some reason every time I ask a question over there I get 1000 answers and comments that have nothing to do with the original question. Or they basically tell me to search on Google and do some reading. Lol
5
Posted on 4/14/26 at 6:46 am to LanierSpots
Dangit man, should have asked the pool guy when he stopped by the other day
-I’ve been on here way too much lately
-I’ve been on here way too much lately
Posted on 4/14/26 at 6:51 am to baldona
quote:
should have asked the pool guy when he stopped by the other day
I was on a charter and to be honest, I am not sure either of them could have answered any question about anything.
Posted on 4/14/26 at 6:53 am to LanierSpots
Put all of this info into an AI app like Gemini and/or Grok.
Posted on 4/14/26 at 7:50 am to TigerAlum1982
Grok said replace 58% of the water. That seems to be the consensus from everyone as well. Half the water
I am going to aim for half the water but I am sure, in true Lanier fashion, I will keep draining once it gets to half the water gone
I am going to aim for half the water but I am sure, in true Lanier fashion, I will keep draining once it gets to half the water gone
Posted on 4/14/26 at 10:01 am to LanierSpots
Have you tested your fill water ?
I’m outside BR and we have higher calcium in the tap water, not 700, but I think 300ish.
If you drain and fill but your tap is 700, you didn’t fix anything.
Don’t worry about the salt, splash out, rain etc. will come down.
I’m outside BR and we have higher calcium in the tap water, not 700, but I think 300ish.
If you drain and fill but your tap is 700, you didn’t fix anything.
Don’t worry about the salt, splash out, rain etc. will come down.
Posted on 4/14/26 at 10:23 am to LanierSpots
Your hardness isn’t an issue. It is an issue that your alkalinity is way too high for that hardness level and pushing your pH to the moon. Higher hardness means Ph should be 7.2ish but you can’t keep it that low with too much baking soda.
CYA is higher than I like it but maybe that’s ok for salt pool.
I don’t see any reason to drain. One treatment of phosphate reduces can bring 700 to zero if you even care about that. Calcium isn’t a pool enemy, it just requires alkalinity be a little lower or else you go through a lot of acid.
CYA is higher than I like it but maybe that’s ok for salt pool.
I don’t see any reason to drain. One treatment of phosphate reduces can bring 700 to zero if you even care about that. Calcium isn’t a pool enemy, it just requires alkalinity be a little lower or else you go through a lot of acid.
This post was edited on 4/14/26 at 10:50 am
Posted on 4/14/26 at 1:47 pm to LanierSpots
quote:
Last testing was Monday by local pool store.
tbh you should get your own kit and test I wouldnt trust anything from the pool store.
Posted on 4/14/26 at 2:28 pm to diat150
quote:
tbh you should get your own kit and test I wouldnt trust anything from the pool store.
Best advice for any pool owner. Invest in a high quality pool test kit and seek input from Trouble Free Pools website.
Posted on 4/14/26 at 4:35 pm to diat150
quote:
tbh you should get your own kit and test I wouldnt trust anything from the pool store.
I have a taylor kit and check mine weekly. I also have the pool store check my water once a month and save their readings for
equipment warranty.
I do the trouble free pool method for the most part. I also ask over there, like I stated above. I got one or two good answers, and then a bunch of nonsense. Looks like the consensus is I need to replace about 50 to 60% of my water. Will work on it on Wednesday and report back. Thanks for all the advice.
Posted on 4/14/26 at 6:02 pm to LanierSpots
How in the hell are you not precipitating calcium phosphate right now? I’m unfamiliar with pool values but I am familiar with water treatment chemistry.
As far as figuring out how much water to add, all water has calcium in it to some extent. To calculate how much you need to drain and fill you need your target value as well as the calcium concentration of your makeup water. Then you solve for X in the below equation:
[(7,500 - X)(720)+(X)(Ca Hardness of makeup water)]/7,500 = (Target Calcium Hardness)
As far as figuring out how much water to add, all water has calcium in it to some extent. To calculate how much you need to drain and fill you need your target value as well as the calcium concentration of your makeup water. Then you solve for X in the below equation:
[(7,500 - X)(720)+(X)(Ca Hardness of makeup water)]/7,500 = (Target Calcium Hardness)
Posted on 4/14/26 at 6:24 pm to LanierSpots
quote:
then a bunch of nonsense
All I saw was people trying to help. You seem to have a shitty attitude toward people giving you help for free.
Posted on 4/14/26 at 8:20 pm to diat150
quote:
All I saw was people trying to help. You seem to have a shitty attitude toward people giving you help for free.
Some of them were constantly telling me how I need to test my water myself which I had already said I was doing. Over and over. I get it. They hate the pool stores but I need those read outs to battle with my equipment guys if I have a warranty issue. Thats the main reason I use the pool store every 4-5 weeks. My pool installer was pretty adamant about me keeping up that as Jandy is pretty shitty about replacing equipment. And it already helped once. My Control box on my salt system was not working correctly. The very first thing they did when the came out was tell me my alkalinity was bad so it was my fault. Problem was, they were not even at my house. I had my print outs from Leslies and I had my app that I record my own data when I test and adjust the water weekly. They replaced the box arfter that and my salt system worked perfectly.
I already know my calcium is high. I was only looking for help with the drain and refill amounts. My attitude was fine. Just looking for help with a certain subject.
Posted on 4/15/26 at 5:42 pm to LanierSpots
I wouldn’t worry about the CH as long as it’s not so high that the water is cloudy.
Posted on 4/15/26 at 6:21 pm to turkish
yea, Im not one to leave it that high if I need to fix it. I think it has been this way for a while, since we bought the pool, and its time to fix it.
I tested the tap water today. The CH of the tap water is 130 while my pool water is 700 today. I also tested the TA of the tap water and its between 40-50
I am going to do this on Saturday and Sunday. Im planning on replacing 60% of the water. I also have some very light scale around my water falls and spa over flow that I plan on cleaning up wile the water level is down
I will report back after the weekend.
I tested the tap water today. The CH of the tap water is 130 while my pool water is 700 today. I also tested the TA of the tap water and its between 40-50
I am going to do this on Saturday and Sunday. Im planning on replacing 60% of the water. I also have some very light scale around my water falls and spa over flow that I plan on cleaning up wile the water level is down
I will report back after the weekend.
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