Zodiac Polaris R0535800 Replacement 9300/9400/9500 Ultra-Fine Sand and Silt Filter Canister

Quick hits: It's awesome for removing fine dirt/silt. Outrageously expensive but absolutely necessary.===============================================================================The seller's markup is massive - especially for a product that should have been included with the pool robot. The stock filter is great at picking up large debris but is woefully inadequate for dirt.After running this filter for the first long cycle, I was shocked by how much fine silt "mud" was collected. After running a total of three long cycles with this filter, our pool is obviously much cleaner.I wish I would have purchased this sooner - but am also annoyed that Polaris didn't include this with the stock robot. It was hard to accept the price - until we saw the results from using it.I deducted one star from durability because it is not a perfect fit with the original equipment. It does not mate smoothly with the filter top piece (whatever it's called).

This filter is a must have if you don’t have regular pool service. It picks up any bit of dust powder dirt or algae at bottom of pool! Soooo thankful!!!! I use the regular filter that came with my vacuum for picking up big leaves and debris and then go behind a few times at least once a week with this filter and it will get any bit of fine dirt or fine particles from the shock that have fallen to the bottom of the pool, and it will make my pebbletec last longerBecause I don’t have shocks sitting on the bottom of my pool

I tried the new Polaris pool cleaner with its "came with" filter debris containment. It did a very good job but after the dust settled, the crease lines in my pool liner had fine particles outlines on them. After running it with the ultra-fine filter there was no debris left whatsoever!

This cartridge is markedly finer than the original equipment filter of the vacuum. Accordingly, it filters out silt previously left behind. Given a high silt load, as present at pool opening, it quickly clogs while doing its job. Thus, it requires frequent refreshing.

It really picks up the fine granules on the floor of the pool.

needed it for my pool robot. works well

After initial cleanings with my 9550 I was somewhat disappointed by the amount of dirt still on the bottom of my pool. However I already new about this ultra-fine filter and had ordered it the day I got my device. On the first clean it picked up an amazing amount of silt that's so fine it looks like sludge. Even after two more cleans it was still picking it up. This is probably not surprising since my pool used to have a DE (diatomacous earth) filter that I ditched when the canister split, and I wanted to the lower maintenance, lower impact of a paper cartridge filter. I'm assuming a lot of the junk is actually DE particles that have been circulating in the system since then.Clearly this junk is still passing through the cartridge filter which probably explains why when I swept all the dirt to the main drain it would come right back the next day. So combined with regular cleanings using the Polaris ultra-fine filter I think I can a) remove the DE entirely, and b) keep the ultra-fine particles out in the future. Since one the reasons for using DE is to get rid of fine particles I'm confident this is combo of cartridge + robotic ultra-fine filtering is a good way to go. Obviously the robot won't filter 30,000 gallons a day but incrementally I think it will let me easily stay on top of particulates.I'm guessing that use of high pressure hose jets are probably responsible for a lot of the claims about the filter breaking or separating so I recommend a gentle spray from the outside to wash out dirt and then pick out any big bits that stick. There's really no need to blast it or scrub it.Also note if you pick up a lot of silt in your pool the filter will probably block quickly. You'll need to clean at least once per use if not more.The standard filter looks pretty fine but you'd be really surprised how much gets through it so all in all I'd say this ultra-fine filter is an essential add on for the Polaris cleaners. Given it probably only costs them $5 to make I think they should just included one in addition to the medium version as standard. While that loses them a bit of profit my guess is it would more than pay back the extra cost due to happier customers who get a very clean pool the first time and don't return it unsatisfied because they either didn't know about the other filters or didn't want to spend another $50+ or more for what they consider essential.

It filters out smaller particles do that the pool is cleaner,

To be used when youbgot small dirt in your pool. Works better than the normal filter.

Has held up great.

The filter works for small sand particles. Works very well. Not sure why I have to Spend an extra $200 to find a filter that works. Why wouldn’tThe filter that came with the pool vacuum work ? Money grab…..

Was the right replacement but by the 2nd year it also split along the seem. Pricey for something that doesn't last. We have been gluing the edge.