Rongjian manufactures pool filter balls, the lightweight polyester-fibre balls that replace sand in swimming-pool and industrial sand filters. Spun from 100% virgin polyester fibre into a soft, springy ball, sometimes called pool filter cotton balls, they pack into the filter the same way sand does but weigh a tiny fraction as much and trap far more dirt. Water passes through the fibre and suspended solids are caught right through the depth of the ball.
The balls have a density of 0.94 to 0.98 g/cm³, a porosity of 92 to 98% and a dirt-holding capacity of about fifty times their own weight, so they filter finer than sand and run longer between cleans. They wash clean and are reused for three to five years, and an oleophobic grade repels oil and resists clumping for oil-water separation in industrial wastewater. We supply them for pools, municipal sewage and industrial filtration, factory-direct.
Typical specifications for Rongjian pool filter balls, also supplied as industrial fibre filter balls. A standard grade covers pools and general filtration; an oleophobic grade is made for oil-water separation. The balls drop into an existing sand filter in place of the sand.
| PROPERTY | VALUE |
|---|---|
| Material | 100% Virgin Polyester / PET fibre |
| Appearance | White fibre ball |
| Density | 0.94–0.98 g/cm³ |
| Porosity | 92–98% |
| Dirt-Holding Capacity | 50× self weight (6–10 kg/m³) |
| Filtration | Deep-bed, finer than sand |
| Oil Resistance | Oleophobic / oil-repellent (oleophobic grade) |
| Service Life | 3–5 years |
| Standard | Industrial grade, ISO 9001 |
| Replaces | Pool and industrial filter sand |
Pool filter balls go into any sand filter, from a backyard pool to an industrial wastewater plant, and replace the sand with a lighter, higher-capacity media. The four duties below cover most of what buyers order them for.
We have produced pool and industrial filter balls since 2010, out of Jiangxi in China, and ship them to pool suppliers, distributors and water-treatment plants around the world as a lighter, longer-lasting replacement for filter sand. Because we make both the standard and the oleophobic grade, the media is matched to the duty rather than forced to fit one product.
We hold the standard grades and offer OEM size, colour and packing, with the balls supplied in bags sized to the filter. Standard supply runs from sample quantities up to bulk orders by the tonne or the container, with the test report shipped against the order and a reply on quotes within a day.
The balls are spun from 100% virgin polyester fibre, not recycled stock, which is what keeps them clean, consistent and long-lasting in the filter. Virgin fibre carries no contamination into the water and holds its loft, so the ball keeps its open structure and high dirt-holding instead of matting down over a season. The same fibre is what lets the balls be washed and reused for years.
Because the balls are mostly fibre and air, the media for a given filter weighs a fraction of the sand it replaces, so a kilogram of balls stands in for tens of kilograms of sand. That cuts the freight on every order, takes the heavy sand bags out of a media change, and lets one light carton cover a filter that would otherwise need a pallet of sand. It is the weight, as much as the filtration, that makes pools and plants switch.
We ship pool and industrial filter balls to over a hundred countries. The balls are light and compress for transport, so they bag and ship cheaply and a filter's worth takes little space, and OEM packing and printing can carry a distributor's own brand. From a sample bag to a container, the order is packed and documented for export.
We are a factory, not a trading company. Every product ships from our own production lines in Pingxiang. You deal with the people who actually make the product.
learn more about us
Pool filter balls are soft balls of polyester fibre that replace the sand in a pool filter. Water passes through the open fibre and suspended solids are caught right through the depth of each ball. Because they are mostly fibre and air, they weigh far less than sand, trap more dirt and filter finer, giving clearer water.
A given filter takes far less weight of balls than sand, roughly a kilogram of balls in place of twenty-five to thirty-five kilograms of sand. The exact amount depends on your filter, which is sized by the sand it normally holds. Tell us the filter model or the sand weight it takes and we will tell you how many balls to order.
For most pools, yes. They are lighter, hold more dirt, filter finer for clearer water, and wash and reuse for years instead of being dug out and replaced. Sand is cheaper to buy and still fine for basic duty, but on weight, water clarity and ease of handling the balls win. We help you weigh it up for your filter.
Yes. The balls are made to drop straight into a standard sand filter in place of the sand, with no change to the pump or the plumbing. You take out the old sand, put in the balls to the level the filter needs, and run it as before. It works in pool sand filters and in industrial deep-bed filters alike.
They are backwashed in place like sand, and when they need a deeper clean they are lifted out and machine-washed, then put back. They do not break down or pack hard, so a charge lasts three to five years before replacing, far longer than a season of sand, which cuts both cost and labour.
Yes. The oleophobic grade is treated to repel oil and resist clumping, so it separates oil from water and keeps filtering in oily, greasy industrial effluent. It is used in steel, petrochemical and machining wastewater for oil-water separation and suspended-solids removal. Tell us the effluent and we will recommend the grade.
The minimum order depends on the grade and packing, and bulk orders ship by the tonne or the container while samples are smaller. Lead time runs from stock for standard balls to a couple of weeks for OEM colour, size or packing. Send the grade and the quantity and we will confirm both on the quote.
Pool filter balls are light balls of polyester fibre that replace the sand in a pool or industrial filter. They sit in the filter where the sand would go, but because each ball is mostly open fibre they weigh a fraction as much, trap more dirt and filter finer. They are sometimes called pool filter cotton balls, after the soft, cotton-like fibre they are made from.
The difference is weight, dirt-holding and reuse. The table below sets out what changes when balls replace sand in the same filter.
| PROPERTY | FILTER BALLS | FILTER SAND |
|---|---|---|
| Weight in a filter | ~1 kg | 25–35 kg |
| Dirt-holding | 50× self weight | Lower |
| Filtration | Finer, clearer water | Coarser |
| Reuse | Washable, 3–5 years | Replaced periodically |
| Handling | Light, easy to load | Heavy bags |
A filter is sized by the weight of sand it holds, and the balls go in by a much smaller weight, roughly a kilogram of balls for every twenty-five to thirty-five kilograms of sand. The simplest way to order is to read the sand weight off the filter or its manual; we then convert that to the weight of balls and the number of bags. The balls are filled to the level the filter needs, not packed tight.
Filter balls are made to drop into a standard sand filter with no change to the pump or the plumbing. The old sand is removed, the balls are loaded to the right level, and the filter runs as before. They suit pool sand filters, cartridge housings and industrial deep-bed filters, so the same product fits a backyard pool and a wastewater plant.
In normal use the balls are backwashed in place, the flow reversed to lift and rinse them. When they need a deeper clean they are lifted out and machine-washed, then returned to the filter. Because polyester fibre does not break down or pack hard, a charge lasts three to five years, far longer than seasonal sand, which is where the saving in media and labour comes from.
Beyond pools, an oleophobic grade is treated to repel oil and resist clumping. In industrial wastewater it separates oil from water and removes suspended solids in deep-bed filters, holding up in oily, greasy effluent that would blind sand or ordinary fibre. This is the grade used in steel, petrochemical, machining and food-processing wastewater, where oil-water separation matters.
Consistent fibre and clean, virgin polyester are what keep the balls filtering evenly and lasting their full life. The balls are made from 100% virgin polyester to an industrial grade, and we offer OEM size, colour and packing. We supply from sample quantities up to bulk orders by the tonne or the container, sized to the filter they go into.
