Mustard Algea or just dirt/pollen?

Doddsy

Member
Nov 29, 2020
6
Sydney Australia
Pool Size
30000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Zodiac LM3-15
Hey all,

First post on this great website. I have been a covert to the TFP system but I have this ongoing problem (or maybe it isn’t one).
I have a small (30k litre) fibreglass SWC pool in Sydney Australia and I keep getting deposits in the bottom of the pool that looks brown and puff away when touched (see attached photos).
I did an overnight loss test and FC dropped less that 1.
Other stats:
FC 6 (I am letting it drift to 3 as per SWC recommendations)
PH 7.6
TA 75
CH 350
CYA 70
BOR 23 (waiting for more boric acid to arrive)

I have previously taken FC up to mustard shock levels for 24 hours (with lower CYA), lots of brushing but it came back. I have no automatic pool cleaner and manually clean once a week.
Is this actually an algae problem or just normal dirt /pollen that I should except and needs to be cleaned. I am thinking it’s easier to see dirt/pollen in a fibreglass blue pool.
Thanks for your help!

30k litre, fibreglass, Davey Promaster pump, Davey Sandfilter, Zodiac SWC, Clear Choice Labs Testing kit (FAS-DPD).
 

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Last edited:

Doddsy

Member
Nov 29, 2020
6
Sydney Australia
Pool Size
30000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Zodiac LM3-15
It looks like dirt to me. Mustard algae is more yellow in color and would stick to the sides of the pool. Pollen would float or stick to the tile at the waterline. Is there a dirt source nearby?
Yes there is a garden bed around pool. I am surprised there is that much settling at the bottom all the time but must be windy. But your right it’s wrong colour. Also never on sides or floating.
I thought maybe algae couldn’t stick to side of fibreglass pool.
Thanks for your help!
 

CRAD_oz

Well-known member
Jan 13, 2020
89
Sydney Australia
Pool Size
48000
Surface
Fiberglass
Chlorine
Salt Water Generator
Doddsy
I had the exact same problem with my FG pool. I have garden beds all around my pool and heavy rain was washing dirt into the pool. The only way to get the dirt out of the pool was to manual vac to my cartridge filters or to waste. Now I have a Robot cleaner with Ultra fine filters and now no more dirt!
 

Doddsy

Member
Nov 29, 2020
6
Sydney Australia
Pool Size
30000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Zodiac LM3-15
Doddsy
I had the exact same problem with my FG pool. I have garden beds all around my pool and heavy rain was washing dirt into the pool. The only way to get the dirt out of the pool was to manual vac to my cartridge filters or to waste. Now I have a Robot cleaner with Ultra fine filters and now no more dirt!

Thanks, which robot did you get?
 

CRAD_oz

Well-known member
Jan 13, 2020
89
Sydney Australia
Pool Size
48000
Surface
Fiberglass
Chlorine
Salt Water Generator
I have the s200. Not only was it well recommended on here but it came with everything I wanted and nothing of what I didn't want. The Ultra fine filters are perfect for the fine dust/dirt that collects in my pool.
 

Jezza

LifeTime Supporter
TFP Guide
Jan 18, 2015
993
Bunbury, WA, Australia
Hi Doddsy. For what it's worth i think what you are describing is dead algae. It is hard to tell from the pictures. If it puffs away when you brush it then that is a tell tale sign. Unless it's fine dust. Dirt and sand just tends to move around.
It only takes 1 occasion to drop below the appropriate FC level and you will be battling away until you eradicate it completely. The dead algae could be the result of when you raised the FC to mustard level but you need to start with a standard SLAM as I think it's probably green algae.
 
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Doddsy

Member
Nov 29, 2020
6
Sydney Australia
Pool Size
30000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Zodiac LM3-15
Hi Doddsy. For what it's worth i think what you are describing is dead algae. It is hard to tell from the pictures. If it puffs away when you brush it then that is a tell tale sign. Unless it's fine dust. Dirt and sand just tends to move around.
It only takes 1 occasion to drop below the appropriate FC level and you will be battling away until you eradicate it completely. The dead algae could be the result of when you raised the FC to mustard level but you need to start with a standard SLAM as I think it's probably green algae.

Alright, I’ll put through another SLAM just to make sure. I’m pretty sure I haven’t dropped below 3 since last one but I’ll do one just in case. Thanks.
 

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Lilypad

Silver Supporter
Bronze Supporter
Nov 12, 2016
271
Plano, Texas
Many of us keep our FC on the high end of the scale, as appropriate for our individual CYA levels. It is safe to swim in and gives you that extra wiggle room if you miss a chlorine addition. Keeps any problems at bay. (y)
 
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Jezza

LifeTime Supporter
TFP Guide
Jan 18, 2015
993
Bunbury, WA, Australia
Just make sure you keep at the SLAM going until there are no signs of any of the dead algae in the water. Hopefully you should find that it will clear up over time. Remember to keep running the filter 24/7. Always pays to keep recording your FC levels as you go along as it allows you to track how your going.
 

Doddsy

Member
Nov 29, 2020
6
Sydney Australia
Pool Size
30000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Zodiac LM3-15
Just make sure you keep at the SLAM going until there are no signs of any of the dead algae in the water. Hopefully you should find that it will clear up over time. Remember to keep running the filter 24/7. Always pays to keep recording your FC levels as you go along as it allows you to track how your going.
Ok so not just until it passes a OCLT? Actually until there are no more signs of algae on the floor or poll.
 

Jezza

LifeTime Supporter
TFP Guide
Jan 18, 2015
993
Bunbury, WA, Australia
Yep the 3 criteria that you have passed the SLAM are

1.) Your pool is clear- no signs of algae dead or alive
2.) You pass the OCLT
3.) Your CC's are 0.5 or less

You must tick all 3 to declare you have it licked- otherwise there is a good chance it comes back again and you go through the cycle again
 
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