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PR-10,000 Frequently Asked Questions

Here are the most commonly-asked questions we get about PR-10,000.




PR-10,000 is our concentrated phosphate remover, and our most popular product. We get a lot of the same questions about it. If this article does not answer your question, just ask us here.

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Why does PR-10,000 cloud the water?

The process of removing phosphates from water requires changing the state of the phosphate molecule into a solid, which precipitates out of solution. This precipitate (white dust) can be vacuumed or filtered out. Until the precipitate falls to the bottom or gets filtered out, it first presents itself as white clouding in the pool.

How long until it is safe to swim after using PR-10,000?

PR-10,000 is certified to NSF/ANSI Standard 50. That means when used as directed, PR-10,000 is nontoxic and nonhazardous in your water. That being said, from a safety perspective, water clarity matters. We recommend waiting until you can clearly see the main drain at the bottom of the pool before anyone can swim. Obstructing visibility with a giant cloud is not a good idea.

Is PR-10,000 Lanthanum based?

No, PR-10,000 is not lanthanum-based, unlike most phosphate removers in the swimming pool industry. PR-10,000 is made from mined rare earth, however. Because of that, there may be trace amounts of lanthanum in PR-10,000. There's no practical way of avoiding it, given the nature of how rare earth is mined and processed. Purity and safety are our top priorities with all of our products, which is why everything we make must be NSF-50 certified before we take it to market.

Why does the bottle say do not exceed 8 oz. at a time?

Our recommended maximum dose is 8 fl.oz. (0.24 L) per 10,000 gallons (38,000 L) at a time. So if you have a 20,000-gallon pool, the max recommended dose would be 16 ounces. We have this limit to reduce your risk of overdosing the pool with too much PR at one time. If you overdose, there can be an overwhelming amount of precipitate that falls out of solution, and it can build up too much pressure in your filter. So we have found it more effective to stay at or below 8 ounces per 10,000 gallons at a time.

Do I need to clean/backwash the filter before adding PR-10,000?

It depends on what your filter pressure is. If you are already 5-10 PSI high, a backwash might be a good idea. If you have a D.E. filter, consider shutting off circulation about 10 minutes after adding PR-10,000, then come back the next day to vacuum the dust to waste. If you are planning a D.E. filter cleaning, add PR-10,000 the day before. Then come back and clean the filter and replace the media. But generally speaking, no, you don't need to clean or backwash your filter before using PR-10,000. You will need to do so afterward.

How long do I need to run the filter after adding PR-10,000?

There are a few ways to clean up the precipitate that PR-10,000 creates. You can run the filter 24/7. The longer it runs, the faster the cloudiness clears up. The second option is to run the filter on its normal cycle, which will clear the cloudiness eventually (if you're not already running 24/7 on a variable speed pump). The third option is to shut off circulation about 10 minutes after adding PR-10,000, and leaving it off until you come back the next day to vacuum out the dust on the floor of the pool.

Does PR-10,000 leave behind a residual?

No. PR-10,000 reacts on contact with phosphates, and once that reaction is complete, all that is left is an inert precipitate that looks like a fine white powder. It clouds up in the water initially but then falls out of solution to be filtered or vacuumed out.

How does PR-10,000 compare to CV-700?

PR-10,000 is a concentrated phosphate remover, whereas CV-700 is primarily an enzyme that contains a weaker phosphate remover blended in. The phosphate remover in CV-700 is not PR-10,000. So in terms of phosphate removal, PR-10,000 is much stronger by volume.

How does PR-10,000 compare to other phosphate removers?

You can ask any pool professional who has used different brands of phosphate remover for their opinion on this. There's a really good chance we will like their answer.

What else can PR-10,000 be used for?

We have used PR-10,000 to help clean up calcification in commercial filters, as well as helping to clean stubborn 'gunk' on tile lines and other pool surfaces. It is not a tile cleaner, but it can cut through scum pretty well. We also use PR-10,000 alongside CV-600 or CV-700 enzymes for certain procedures; namely the sand filter purge.

Can I add PR-10,000 and chlorine at the same time?

Yes, in fact, PR-10,000 complements chlorine quite well. We recommend using it immediately after a chlorine shock in certain procedures, such as the green pool cleanup, the 'Orenda Bomb', and superchlorination. And of course you can also use PR-10,000 alongside chlorine in normal doses too. They are compatible in the water. 

Can PR-10,000 be used in saltwater pools?