Algae and my new plaster

patdelacruz

Member
Jul 6, 2012
8
Panama City Beach
I love the TFP method, I used the BBB for 5 years until I recently had my pool replastered. Now I have to submit water once a month for testing to keep my warranty. I have been keeping my SWG pool at FC 5-7, CYA 70-80, pH 7.5-7.8, TA 70-90. The reason for the high FC is that I live on a golf course with a slow moving stream between me and the golf course and I've had a few run ins with algae. I think the phosphates from the fertilizer being blown with machines on fairway toward my pool seem to cause algae blooms. At any rate the new chemical requirements are causing me problems. I'm supposed to keep my FC at 1-3 the CYA 40-60, TA 75-90 and pH 7.2-7.6. I've been using what I thought was a non-chlorine shock because I've been afraid of getting an algae bloom. But, it turned out to be 37% chlorine. The pool company says high chlorine will cause staining on our new Sunstone Golden Pearl. How can I keep my warranty and keep from having algae? And how do I get my pool stats at the bottom of my posts?

19x38 22,000 gal SWG gunite pool Hayward sand filter
 

JVTrain

TFP Expert
Feb 3, 2014
5,081
Central Minnesota
Once a month to test, let your FC drop to 3 and collect a sample? :mrgreen: According to the Chlorine/CYA chart in Pool School, you can run a SWG at 60 CYA with a minumum FC of 3. Probably not optimal for FL, but doable. If you want insurance, you could add some Polyquat 60 as an algae preventative.

To add the details of your pool to your signature, click on the Settings link in the upper right, then click the Edit Signature link on the left side. Add your details and be sure to click Save when done.
 

patdelacruz

Member
Jul 6, 2012
8
Panama City Beach
Thanks for the quick replies! I take my sample to the pool builder which is about a mile away so time is not a problem. And I had thought that letting the FC go down once a month was my only option so you've confirmed my thoughts. But am I really going to get staining of my new plaster at FC 5-7 or is this something they tell you to get you to buy lots of products? I will put my info on my signature on future posts, I need to get some more info. first.
 

RobbieH

TFP Expert
LifeTime Supporter
Aug 30, 2010
4,052
Dallas, TX
In my opinion your target of 5-7 sounds good. But, in this case you are bound to what the pool company thinks is right.

If you let your sample sit out for a while, FC will go down.

The addition of phosphates will not cause an algae bloom if FC is sufficiently high to inhibit growth. If your FC is 5+, phosphates aren't going to do a thing.
 

JVTrain

TFP Expert
Feb 3, 2014
5,081
Central Minnesota
I'm no plaster expert by any means but I would say having an FC of 3-5 (the proper levels) would actually prevent staining. The root of this problem is pool companies having no clue or not admitting to the true relationship between CYA and chlorine. I can understand them wanting you to keep a certain pH, TA, CH, Salt and even a CYA as those all will affect the CSI level which determines whether your pool water is corrosive or scaling to plaster.
 

patdelacruz

Member
Jul 6, 2012
8
Panama City Beach
Thanks all, I will keep my FC where I know I won't get algae. Over the years I've figured out that to avoid algae I need the higher FC and the help of my local family owned hardware store/pool service who come by while I'm away. Both of my algae blooms happened when the pumped failed and I was out of town. They aren't the cheapest source for pool chemicals, but the service and advice (BBB enthusiasts) are priceless.
Just added my avatar and signature, and while getting all the info together I remembered another question I had but I think it belongs in a SWG thread so I'll put it there so as to avoid confusion.