FC level after successful mustard algae treatment

[calstar]

I seem to remember I should keep my FC in a higher range than if I hadn't had mustard algae previously. My CYA is 30, CYA /FC chart shows target of FC 4-6, what should the target be after a successful mustard algae treatment? thanks

levels taken this morning: FC 7 CC 0 pH 7.3 TA 100 CH 700 CYA 30 CSI at these levels 0.06

edit: I've completed the entire process of mustard treatment , normal slam followed by high FC final step.

 

[PoolStored]

19 FC for 24 hours.

 

[Mdragger88]

Do you mean you already completed the
SLAM Process & afterwards raised fc to Mustard algae slam level for 24 hours?
If so then you want to maintain fc at/above Mustard Algae min for some time. (Perhaps the rest of the season).
For a cya of 30 that is 4.5ppm

Chlorine/CYA Chart

EDIT: You will find a simplified and standardized version of this chart at Pool School, Chlorine / CYA Chart. Chlorine/CYA Chart by Chemgeek FC = Free Chlorine in parts-per-million (ppm) CYA = Cyanuric Acid in parts-per-million (ppm) CYA ........... Min FC3 ..... Target FC ...... Yel/Mstrd...

www.troublefreepool.com

 

[calstar]

Here is the FC/CYA table that includes mustard algae, with CYA 30 the minimum(no reserve) is 4.6ppm, to be safe it seems I should stay in the 6-7 range giving me adequate reserve, I believe that was my target previously before I slacked off with keeping it there. Is the 6-7 FC range where I should be for my FC target?

 

[PoolStored]

You are reading it wrong. Yell/must/shock is what you need to look at (Last column)

Maintain 19 FC for 24 hours after you finish SLAM.

Mustard Algae

Today We are going to show you how you can get rid of mustard algae in your pool. By following the steps in this guide and with no expensive chemicals.

www.troublefreepool.com

 

[Mdragger88]

As poolstored said then afterwards- MA minimum (4.6) or above.
Most of which is covered by normal target ranges listed in
FC/CYA Levels

Maintaining 6-7 ppm is fine too.
As you said,
it will give you a buffer before reaching MA minimum if you’re concerned about MA returning.
For what it’s worth most people just have regular algae. It can be many colors.
The MA protocols are mostly for precaution if MA is suspected. The regular slam process does the bulk of the work.
All 3 slam exit criteria should be met (including no recurring algae dead or alive) before proceeding to MA slam level for the 24 hours as the final nail in the coffin. Then MA minimum maintenance level thereafter for ultra reassurance.

 

[calstar]

You are reading it wrong. Yell/must/shock is what you need to look at (Last column)

Maintain 19 FC for 24 hours after you finish SLAM.

Mustard Algae

Today We are going to show you how you can get rid of mustard algae in your pool. By following the steps in this guide and with no expensive chemicals.

www.troublefreepool.com

As I've noted with an edit(sorry guys you didn't see it) in my original post I have successfully completed the mustard algae treatment with normal slam 1st followed by the high FC mustard "shock" with all criteria met, my question was regarding a safe level of FC for preventing future mustard algae

 

[PoolStored]

As I've noted with an edit(sorry guys you didn't see it) in my original post I have successfully completed the mustard algae treatment with normal slam 1st followed by the high FC mustard "shock" with all criteria met, my question was regarding a safe level of FC for preventing future mustard algae

Ah...

If you have mustard algae issues, you should use 15% of your CYA level as your minimum FC level. Target 20% of CYA for your Target FC.

 

[TinFoilHat]

It depends on your CYA and what the chart above tells you.

 

[PoolStored]

It depends on your CYA and what the chart above tells you.

If you have mustard algae issues, you should use 15% of your CYA level as your minimum FC level. Target 20% of CYA for your Target FC.

 

[calstar]

As poolstored said then afterwards- MA minimum (4.6) or above.
Most of which is covered by normal target ranges listed in
FC/CYA Levels
View attachment 596615
Maintaining 6-7 ppm is fine too.
As you said,
it will give you a buffer before reaching MA minimum if you’re concerned about MA returning.
For what it’s worth most people just have regular algae. It can be many colors.
The MA protocols are mostly for precaution if MA is suspected. The regular slam process does the bulk of the work.
All 3 slam exit criteria should be met (including no recurring algae dead or alive) before proceeding to MA slam level for the 24 hours as the final nail in the coffin. Then MA minimum maintenance level thereafter for ultra reassurance.

I'm curious, do most members here maintain their FC at the minimum suggested level? According to FC/CYA tables the suggested target level at 30 CYA(Ma and non MA) is more than twice (or close to it) the minimum level, no one concerned about having reserve levels? Am I just wasting bleach keeping it at MA target level(6-7). I'm losing about 2ppm FC on hot sunny days with minimal or no bathers at , if I used the minimum MA level(4.6 from table) would the FC loss be the same or less under the same conditions than FC of 6-7?

 

[PoolStored]

I'm curious, do most members here maintain the FC at the minimum suggested level?

No.

According to FC/CYA tables the suggested target level at 30 CYA is more than twice (or close to it) the minimum level, no one concerned about having reserve levels? Am I just wasting bleach keeping it at MA target level. I'm losing about 2ppm FC on hot sunny days with minimal or no bathers, if I used the minimum MA level(4.6 from table) would the FC loss be the same or less under the same conditions?

If your CYA is 30, you should use 20% of that as your Target, which is the top of the range, or 6FC. I would dose ABOVE that, so when you test, you get a 6. Do not let it get lower, when you test, if you can.

If you lose 2ppm, dose to 8, so when you test the next day you are 6 or above. If you have to go higher than 8 because of demand, to be at 6 when you test, do it.

 

[borjis]

The best method for prevention is ensuring your fc levels are never below the minimum. I've yet to have ANY algae issues, following that.

 

[PoolStored]

The best method for prevention is ensuring your fc levels are never below the minimum.

You are absolutely correct, but with a pool that has a history of MA, it is better to treat the minimum as 15% of CYA (4.5FC in this case with CYA 30), rather than the chart. And to maintain FC at the top of the chart (20% of CYA) or above.