In ,
SMS spewed forth:
I was getting a lot of algae in my pool. Leslie's measured the
phosphate level at 2500 ppb (actually it was over 2500 but the test
kit tops out at 2500). A good level is about 100.

Leslie's sells PhosFree. A 3 liter bottle costs about $38, and it
would have taken at least 8 bottles ($304) to reduce the phosphates
to an acceptable level. Even the guy at Leslie's said to forget it,
just drain the pool and refill it.

I went to another store (Pool Guys), and they sell Orenda Technologies
PR-10000. 1 quart is supposed to reduce phosphates from 10,000 to 0
for a 10,000 gallon pool. So for my 40,000 gallon pool it would take
1 liter to go from 2500 to 0. A quart cost $60 at the pool store
(though now I see it on-line for less). The pool store guys had never
used it, as it was a new product they carried. With much trepidation
I shelled out $60 for a motor oil bottle size of this liquid.

I applied it in four doses over two days, mixing 8 ounces with 120
ounces of distilled water, and pouring it around the pool and
scattering it over the water. It precipitates with the phosphates and
forms a flocculates that are filtered out, so your water turns a
milky color until you filter out the particulates. I used the regular
filter, as well as my Dolphin pool cleaner which collects debris in
its own cloth filter bag.

After all four doses I went to clean the four PentAir cartridge
filters which were now sot down the precipitate and weighed at least
2x normal. Today I had the phosphate tested again and it was down to
200! Amazing.
Even for maintenance, it's much cheaper to buy the PR-10000 which if I
calculate correctly is 15x as concentrated as PhosFree, and just use a
couple of ounces, than to buy the PhosFree. Which is probably why
Leslie's doesn't sell the PR-10000 or any of the other concentrated
phosphate removers on the market.

I checked the data sheet for what's in PR-10000 but they just say that
it's proprietary.

Regardless which one you use , they work great.
You'll find that you can forget the tabs for a few days and never see a
difference.
It also keeps the black ring from forming at the water level. I've been
using PhosFree for the first time this year and love it.
I'll have to find who sells PR-10000 in my area. I've been paying about $26
for 3 litres online with free shipping for Phos Free, but feel I've saved a
lot more by using less chemicals all summer. I've only shocked once this
summer, used no flocculants, and no soda ash. The water has been crystal
clear ALL summer as opossed to the frequent cloudyness every few weeks. Now
that you've reduced your levels , you'll find using a small maintenece dose
once a week will keep everything inline. You're going to get spoiledg
My understanding of PhosFree is it's an natural enzyme that eats the
phosphates which algae thrives on.