mustard algae

18 foot above ground pool in coastal Mississippi Replaced sand with glass media 1 week ago. Backwashed until clear. I’ve been following TFP since last summer (only 1 year of owning pool so far so still newbie). Last year, I think we had mustard algae and it took me a long time to clear. This...

Hello! Brand new here :) Like many other newbs, I let my pool go over the winter (sorry). I am currently on week two of my SLAM and the water is looking soooo much better; however, now that I can see better I have discovered that many of the walls are stained…. I am on well water, but I...

Hi, I have a very old pool and I think I got the dreaded mustard algae. is this it? egNLT7W2OpU how can I tell if it is dead? I went through SLAM again (second time in a row) and the water is crystal clear. last week I cleaned my sand filter and there were tons of this brown stuff coming out of...

Hey everyone, I'm a relatively new pool owner (9 months) and have a 14,500gal in-ground pool/spa. I've never had any issues with my chemical levels (tested weekly) until I recently started seeing mustard algae growth after a few birthday pool parties (in September and October). My kids also...

I'm 100% sure I have mustard algae in the pool. I can clear it out, but it comes right back within a day or two. I know I need to SLAM the pool, and I read the article about treating the algae, but I had some other questions. 1. Once I get the pool up to the MA/SLAM shock level and clear it...

I've had this brown stuff in the pool, in patches, particularly along the seams, and on the sunny side of the pool - nothing on the shady side, nothing on the walls. This has pretty much been going over the past week. I performed an OCLT test last night and the chlorine went from 8.0 to 5.5...

Hi all, I'm still learning about pool maintenance and planning to use SLAM next year. For now, I'm working with what I've got. It's almost mid-August, and I'm wondering if it's worth tackling the persistent yellow algae before reopening the pool. My pool got hit with algae after weeks of...

5/28 UPDATE WE PASSED OCLT!!!! WOOHOO!!! Thank you so so much for the responses!! One last question: If we see algae start to come back, can I go to MA level? Or do we need to repeat SLAM first? For the love of all that is holy I hope all you knowledgeable humans can help this newbie figure...

I’ve had MA in my pool for at least 3 years now nonstop. I’ve just never been able to get rid of it. I’ve been reading the forums on here for a few years as well. I have a sand filter and we changed the sand to zeolite about 3-4 years ago. I literally just found out last night on here that you...

Went through Hurricane Ian and had a ton of damage to our house and the surrounding homes. Our pool was filled with roofing debris and insulation amongst other things. Had to re-plumb the equipment pad because something took out my filter. Anyway, I'm finally ready to get the pool back open...

FC: 12 CC: 0 CYA: 45 PH: 7.8 TA: 100 Hardness: 125 Above ground pool, ~6900 gallons 14 inch Intex Sand Filter I used a TF-100 test kit My pool is green and has some sandy-like yellow debris at the bottom (I believe to be mustard algae). I have read the SLAM process and have been maintaining a...

We just installed this pool this summer, previously we had a 10k gallon round pool. It had been open just a couple of weeks when problems started. 5 weeks ago it rained for a couple of days and the weather was very warm, the top of the water was beginning to feel slimy but not terrible so I...

Hello TFP members! This is my third summer of pool ownership and our first SLAM procedure. Carelessly let the FC drop lower than needed for a few days and shortly after started noticing what seems to be mustard algae blooms. Performed a "half-way" SLAM with lower FC levels thinking I could get...

Brand new to group! I’ve been fighting this for about three years. I don’t know if it’s yellow algae or something else. It’s not ‘yellow’, more sand color, but it’s powder like if disturbed. I’ll shock, vac to waste, replace water loss only to have it return. It’s isn’t selective where it...

I began SLAM process 5 days ago to address what appears to be mustard algae, but now I wonder if I have misidentified what I have, and have the additional complication of having slacked in frequency of chlorine upkeep due to emergency work time demands since Wednesday. My logs are shared so all...

Been fighting this brownish stain/residue and cannot beat it. Pool was completely clean when I uncovered it in march. Took sample to pool store balanced water. Everything was going good then BOOM this brownish stuff set in. I told pool store and they sent me home with jacks magic the blue stuff...

Hello. I'm new to the site and to the TFP method and I'm hoping someone can let me know if I'm on the right track to treating what I think is mustard algae. I recently fired my pool maintenance company for a number of reasons, including the persistent algae on the southern, shady walls of our...

Hey there y'all! New to having a pool this year and have been dealing with brownish yellow dust for the past month or so. I have used Yellow Out and done the full cycle and Green to Clean and done the full cycle and am still dealing with the same issue. There is a fine yellow brown dust coating...

When I opened my pool at the beginning of the season, I had an algae problem which might have been mustard algae? I wasn't sure and just treated it that way with directions from this site. The water cleared up and the pool has been running clear all summer (Thanks TFP!). Now that I'm getting...

I just purchased enough chlorine to complete the mustard algae slam procedure, but I have some questions before I do it. I slammed about 6 weeks ago after the pump died and algae bloomed for several days, but I did not do the mustard procedure which I am now 100% sure I have (mustard yellow...

I’ve been SLAM’ing for close to a week - my second time doing so because I think I jumped the gun a day or two early last time I believe. I have passed the OCLT three mornings in a row. CC is virtually zero. But there is still a small amount of mustard algae every 12 hours or so, when I vacuum...

I’ve had “mustard algae” for a year and a half and have literally tried everything in the books to kill it and most things twice. We even changed the sand in our filter to zeolite and the laterals looked fine to us plus the seals and all. I get splotches of sand colored stuff in the bottom of my...

We have been battling a problem with mustard algae in our pool since last summer. We closed the pool at the end of last summer and hoped that when we opened it this summer we would have a fresh start but that has not been the case. I bought the recommended testing kit and did the test today. We...

I need help. I found this website through a Facebook group where I posted about having mustard algae I couldn't get rid of. Or at least that's what I think it is. Everyone I've talked to says it's mustard algae. I'm a new pool owner. We bought the house in March and opened the pool in April...

Hello all. So my pool developed mustard algae, I think after the chlorine level decreased when I left town and with the heat and water evaporation, the water level went below the skimmer and warped some of the pipes, making the pump lose prime and stop working. The mustard algae, which I had...

We are shocking using the slam method for mustard algae and we are not making progress after about 32 hours. Chlorine just dropped in the few hours we were at a baseball game after holding for most the day. I’m even using a bit higher amount of chlorine to try to beat it. Our alkalinity will...

Hi guys, We bought this house last year and the pool has always had this stuff at the bottom. Sometimes it seems like it comes from the filter because we will vacuum it up and then the next day after running the filter overnight it will be back.

Hello all! New the forum here. Purchased a house last year that came with a 24,000 gal above ground pool with a Perma Salt system. I read before opening this year that those are frowned upon, so when we opened the pool, we decided to switch to a straight chlorine! I don't think we have added...

Hey everyone. Feeling a bit overwhelmed. I just had a CircuPool RJ60 installed (converting to a SWG) and at the same time the pool guy said I have mustard algae growing. I thought it might have just been pollen but I really knew it wasn't :/ but my water is only 45 degrees so how can it be...

let me start by saying I have 34 years in the industry and I have one pool that no one can figure out. This pool was opened this year in May. It has stayed green since. The 4th of July was the only day it was clear and blue. 2 days later....green again. The pool is super cloudy, can't see the...