Hi Jason;

If you would, please complete the Pool Chart, linked below; doing so will give us some of the information we need to get started. 'Pink algae' or 'pink mildew' is typically a chlorine resistant biofilm. A biofilm is just a slime colony with various things growing in it. There are a lot of reports on the Internet that it's this bacterial species or that red algae -- but very few of those articles appear to have done the microscopic studies necessary to actually reach such a conclusion.

What does seem to be common to most accounts is that pink/red algae/mildew/bacteria in slime layers are
+ persistant,
+ resistant, &
+ resurgent.

In other words, you're going to have get very serious and very consistent about your pool care. For starters, you'll have to get an accurate and reliable test kit -- neither 'guess-strips' (in ANY form) nor dealer testing counts.

You need also need to read the Best Guess page linked in my signature -- unless you know what your stabilizer -- CYA -- level is, it's impossible for you to know that your "chlorine and pH" are "perfect".

Put most simply: if your chlorine and pH had been consistently perfect . . . you wouldn't have pink mildew. What you have to understand is that pool companies have NO interest in having you maintain 'perfect' levels. If you did, you'd only need or want the cheap basic chemicals and would never buy the high-margin pool goop products they love to sell.

Right now, till you get a kit and can post results, raise your chlorine to at least 2x what you've been keeping it at, and BRUSH the heck out of the spots you can see. There are other spots you can't see, but there's nothing you can do about that.

Good luck!

Ben

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+ It's much easier to answer your questions, when we have the details about your pool in one place. We often 'waste' the first few posts back and forth collecting information. So, please complete our new Pool Chart form -- it takes about 30 seconds, but will save much more than that.
Pool Chart Entry Form
+ Here are links to the kits we recommend (you can check local availability on the HTH kit, using the Walmart link):
HTH 6-Way Test Kit @ Walmart
Taylor K2006A (3/4 oz bottles) @ Amazon
Taylor K2006C (2 oz bottles) @ Amazon