BWT ES Range Fibreglass Media Filter

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.

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.

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.

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.

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.

The ES range operates at 2.5 bar with a maximum pressure of 4.0 bar and a maximum water temperature of 43 degrees C. Those limits comfortably cover normal residential use including heated pools. If your system regularly approaches maximum pressure, that indicates a filtration or plumbing issue worth investigating rather than a filter limitation.

The ES range uses quick connect plumbing connections and adjustable inlet and outlet unions, which makes fitting into existing pipework considerably easier than older designs. That reduces install time and cost, particularly in tight Auckland plant areas where alignment with existing pipe runs is the usual complication.

The heavy duty top mounted valve controls the water path through the filter. The six positions cover filter, backwash, rinse, waste, recirculate and closed. Filter is the everyday position, backwash and rinse are for cleaning the media, and waste bypasses the filter entirely, which is what you use when vacuuming heavy debris or algae to drain.

The ES range takes standard filter media. Sand is the traditional choice and generally needs replacing every five to seven years. Glass media typically lasts longer and filters slightly finer. We can advise based on your water conditions and handle the media change as part of a service visit.

The 10 year tank warranty is only as good as the installation behind it, and manufacturer warranties depend on correct installation and commissioning. We have installed filtration on Auckland pools since 1992, we size the unit to your pump, we register the warranty for you, and we handle any claim directly with BWT. Call 09 570 4797 or email info@sparklingpools.co.nz.