How much MA to add at a time

Jun 16, 2016
13
Ellensburg,WA
#1
Pool math is telling me to add 5.1 gal of MA. I'm not opposed to that figure, I'm just worried about adding that much all at once. I'm also concerned about adding the MA and the chlorine at the same time. Seems I read (here I think) that I should wait a period of time between adding the MA and the chlorine. Here are my numbers (target values based on Pool Math calculations): Pool Math is also telling me to replace 11% (3K gal) of the water. I'm thinking that I should replace the water first, then retest. Any suggestions? thanks



NOW - Target
FC 2 - 4

pH 10 - 7.5

TA 230 - 100

CH 270 - 300

CYA 45 - 40
 
Jun 16, 2016
13
Ellensburg,WA
#3
I had to guess at ten as the color was off the chart. My demand test said to multiply by ten, the number of drops it takes to get to the correct color and that was 23
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
3,313
Northern NJ
#4
Set PoolMath PH to 8 and target to 7.2. Add that amount of MA. Test PH again. Repeat as necessary. Keep NOW at 8 until you get a good PH reading.

Adding the MA will lower your TA.
 

Richard320

TFP Expert
LifeTime Supporter
Jan 6, 2010
20,327
San Dimas, CA (LA County)
#6
I had to guess at ten as the color was off the chart. My demand test said to multiply by ten, the number of drops it takes to get to the correct color and that was 23
23 drops would come to over 4 gallons but that still seems extreme.

I would limit things to 1/2 gallon at a time with the pump running and a little brushing to set up some cross-currents. Retest every half hour until the color shows up on the test block.

Just to be sure.... you haven't recently replaced test reagents have you? Because Taylor has two different pH indicators and they're not interchangeable.
 
Jun 16, 2016
13
Ellensburg,WA
#8
I ended up adding 2 gal. of MA and my pH is now 7.2 Free Chlorine is at 0. So, I think I'll add the 2 gal of bleach and then retest the pH before I add the soda pool math suggested. thanks again for the good advice!!
 
Jun 16, 2016
13
Ellensburg,WA
#10
Ignorance speaking here, the soda is what pool math tells me to do, but I wondered about the TA and soda as well, so I thought I had better retest before I added anything else. I guess experience will help as i could go round and round with the testing and never get to where I need to be. I realize that the pool chemistry is not a hard science, it's just challenging sometimes to know what to do and what to leave well enough alone. Thanks for the info, and I won't add anything until I retest. I hope I get to the point when I can relax about when to stop micromanaging the chems.
 

mknauss

Mod Squad
May 3, 2014
12,331
Laughlin, NV
#11
The GOAL levels in POOLMATH are the mid point of a range. If your pH is 7.2, then that is in the range of 7.2 and 7.8. No action needed.

TA should be left alone unless your pH becomes unstable (normally below 50 ppm TA) or is so high it drives your pH up very fast.

Pool School - Recommended Levels This link show the ranges based on your pool surface type.
 

MannyT

Well-known member
Jun 15, 2017
213
Pembroke Pines, Florida
#12
If your test is within the specified range you shouldn't need to change it. Pool math will tell you what you need to get to the desired target that was saved but if you are within the range you necessarily don't need to change unless you are trying to reach a certain CSI.

For example my ph was 7.8 within range but my CSI was .1 and I like my CSI slightly negative I brought it down to 7.6 to get to CSI -1.2 all my other results stayed the same since they were in range but not exactly at my targets.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
3,313
Northern NJ
#13
Ignorance speaking here, the soda is what pool math tells me to do, but I wondered about the TA and soda as well, so I thought I had better retest before I added anything else. I guess experience will help as i could go round and round with the testing and never get to where I need to be. I realize that the pool chemistry is not a hard science, it's just challenging sometimes to know what to do and what to leave well enough alone. Thanks for the info, and I won't add anything until I retest. I hope I get to the point when I can relax about when to stop micromanaging the chems.
All the chemical tests do not have equal importance.

FC is the most important and can change in hours or days. PH is equally important. those two you need to focus on.

TA is tied to PH and is secondary. You only have to deal with TA if your PH is not stable and rises quickly. And best way to take TA down is doing it as you take PH down with MA, aerate to raise PH, and repeat until you get a good PH/TA balance.

Get your FC, CYA, and PH in balance and stable. Then you can move onto your TA and CH if needed.