BWT ES Range Fibreglass Media Filter ES36 50mm

Filter sizing is based on your pool volume and the flow rate of your pump. An undersized filter runs at too high a face velocity, which means poorer water clarity and more frequent backwashing. An oversized one is money spent for no gain. Give us your pool dimensions and pump model and we will specify the right tank size.

The ES range spans six models from ES21 to ES36, with tank heights from 840 mm to 1,300 mm and filtration areas from 0.24 m2 to 0.64 m2. The right model depends on your pool volume and your pump's flow rate. Larger filtration area means slower water passage, better clarity and less frequent backwashing. Send us your pool dimensions and pump details and we will size it properly.

Fibreglass tanks resist corrosion, which is the main reason older steel filters fail. In a salt chlorinated pool, and in Auckland's coastal and humid conditions, corrosion resistance is what determines whether a filter lasts five years or fifteen. Fibreglass also handles the pressure cycling of regular backwashing without fatiguing.

The fibreglass filter tank carries a 10 year manufacturer warranty, with fittings covered for 1 year. The tank is the part that determines whether a filter is a long term asset or a short term purchase, so a decade of cover on it is a genuine point of difference in this category. Your purchase is also covered by the New Zealand Consumer Guarantees Act.

This is a media filter, which is most commonly run on filter sand or a glass media alternative. Sand generally needs replacing every five to seven years as the grains round off and lose their filtering edge. Glass media typically lasts longer. We can advise which suits your water and handle the media change for you.

Most Auckland pool plant sits outdoors, often with limited shade, and UV degradation is a real cause of filter tank failure over time. The dual layer fibreglass reinforced UV resistant construction is built for exactly that exposure. It also holds up well against salt chlorinated water, which covers most local pools.

Backwash when the pressure gauge reads around 8 to 10 psi above the clean starting pressure, not on a fixed schedule. Backwashing too often wastes water and flushes out the fine debris layer that actually improves filtration. We record clean pressure at commissioning so you have a reference point.

The inline sight glass lets you see the water running through during a backwash, so you stop when it runs clear rather than guessing. That saves water, saves chemicals and avoids the two most common mistakes: stopping too early and leaving debris in the media, or running far longer than needed.

The multiport valve sits on top of the tank rather than on the side. Top mount is the most common configuration on Auckland residential pools, is generally more compact in a tight plant area, and is straightforward to service. If your existing filter is a side mount, the plumbing will need adapting, which we assess during the quote.

Backwash when the integrated pressure gauge reads roughly 8 to 10 psi above the clean starting pressure. In an Auckland summer with regular use, that is often every two to four weeks, and more frequently through heavy leaf fall in autumn. We note the clean baseline pressure at commissioning so you have a clear reference.