Hello, I recently went on vacation and when I came back my pool was
filled with green algae. This stuff was all over the vinyl liner
including the walls and floor. The pool was built just a few months
ago. I am using a 2hp Hayward sand filter. I went to my local pool
supply store and they recommended that I balance the water and then add
yellow out algaecide which I did. The confusion comes because I have
add this stuff and do not know If I should live the filter on with its
super-chlorination or turn it off with no chlorination. The only way
chlorine is produced is by having the filter on because I have an
electronic chlorine generator. So what do I do? Some web sites say
leave it on, others turn it off so that the algae will die and clump
If you do not trust the pool store's advice, consider that
(1) algicide will kill the algae;
(2) you must then remove the dead algae from the
Your two choices for this are:
(a) Run the pump, which will move algae into the
filter. You must then clean the filter
(b) Vacuum to waste, i.e. remove both algae and
the bottom of the water column where the algae
You can then restart from scratch (same as at the
beginning of the pool season) as the pool store recommended.
You can use chlorine granules (with or without the
chlorinating pump) if it accelerates stage #1 (balancing.)
Lower pH to 7.0 or so with pool acid, superchlorinate (with hypochlorite
from the pool store), keep pH low, run filter.
Chlorine (and acid to lower pH) alone will clean up any algae bloom; you
don't need the algaecides.
Start the chlorine dosing at dusk.
I would check you chlorine generator is working, You may not be running it
long enough. You might have to dial up the percentage up. How often do check
the chlorine level? do you have you water tested? The hotter the pool gets
the more chlorine is used . Check your Stabilizer( synergic acid sp) If your
pool has a chlorine generator check the salt level. Check for phosphates,
algae food, to high of a level it will eat the chlorine. You have to find a
Good pool supply to test your water and teach about pool chemistry. Stay
away from Leslie's if you have one. Sounds scary but it's not, there is a
learning curve. A pool is like a boat $$$$$$$ and I know if I dig down
there is a trailer under it.
After I came home and saw the pool I went directly to my local pool
supply (not Leslie). This is what they told me to do:
Add 18.5 lbs. of total alkalinity increaser. Wait 2 hours then go to
the next step.
Add 4.75 lb of pH decrease. Note that my pH was 7.8. Wait 15 min. then
go to the next step.
Press the super chlorinating button on generator.
Add 4.5lbs of Algae Destroyer a.k.a. Yellow Out. Brush pool, Run 24
hrs. Vac. to Waste. This is the step that I am currently at.
Add 5lbs. of Chlorine Stabilizer after treating algae.
tot. Chlorine 0
Free chlorine 0
Demand Drops 2
Tot. Alkalinity 100
Adj. Alkalinity 97
Tot. Hardness 120
This was done when I went to the pool supply store and NOT after I
followed their treatment regimen. I have a 20,000 gal. vinyl pool (in
The people at the pool store are idiots and swindlers.
First of all, to clean up algae, use superchlorine in a single dose. Your
salt generator simply will not deliver that much chlorine quickly. You
need a few gallons of fresh 12 percent sodium hypochlorite. That and pool
acid, not dry "pH down". This should cost you less than 10 bucks. That
should be *all* you need to clean up your pool.
Second, the "yellow out" will quickly deplete any chlorine you have in the
pool. Chlorine that would have cleaned up the green algae. You don't have
yellow algae anyway, why are they selling you that yellow treatment (which
doesn't work any better than chlorine at 1/10 the price)?
You don't need alkalinity increaser, at least not until you get your pool
cleaned up. Then you can fuss with balancing the water, which isn't very
important in a vinyl pool anyway. Don't use "stabilizer", it will spoil
your chlorinating action.
for a ride. I am now looking a pool supplies and find that some/ most are
lithium hypo chlorite or calcium hypo chlorite. Is this the equivalent of
sodium? Can you recommend a place where I can buy this stuff online? Thank you
and everyone else for their help. It has actually been very frustrating after
spending $xxx at the pool supply place and seeing no results.
On Thu, 10 Aug 2006 00:18:10 -0500, Richard J Kinch
Over the 30 or so years my Pool has been used I have learned that
getting water "tested" by pool stores always produces a long list of
needed "stuff" and a long list of do this wait 2 hours etc...
Richard is completely (as usual) correct... although I normally use
Dry Ph Decreaser or Increaser...just easier to keep a Jug on hand...
On the stabilizer ? Honestly I do use it .. But if the level gets
very high the only way to decrease it is to drain a lot of water out
of your pool and refill with fresh water... Only had this problem once
in 30 or so years ... so it has not been a big deal...
Vaccum to waste is your friend ... LOL
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