Aqua UV Parts & Accessories

Genuine Aqua Ultraviolet replacement parts and consumables for Classic series UV sterilizers and Ultima II bead filters — lamps, quartz sleeves, transformers, seals, O-rings and gaskets, plus the Ultra Bio-Media the Ultima II runs on.

The two parts most people are here for: the UV lamp, which is a 14-month consumable that keeps glowing long after its output has died — replace it on the calendar, not by eye — and the quartz sleeve, which scales over in hard water and quietly blocks the UV even with a fresh lamp behind it. If your water went green with a lamp that "still works," it's one of these two.

Ordering the right part: everything here is model- and wattage-specific. Order by the wattage on your unit's label, never by measuring the old part — the 25 W and 57 W lamps are the same physical length and will happily slide into the wrong unit. On Ultima II valve parts, count the screws in your valve cover: six means the 1-1/2" valve, ten means the 2".

Aqua UV holds these at manufacturer-set pricing, so the price you see is the floor anywhere — what we add is stock on the shelf in San Jose and help matching the part. Not sure what you have? Send us a photo of the unit's label and we'll confirm before you order.

Worth knowing before you buy

Ground rules and answers from the ponds we run every day in San Jose.

Common questions

I am not sure what I need. Can you just tell me?＋

Gladly, and this is genuinely the fastest route. Send us your pond volume, your depth, roughly how many koi you keep and how big they are, your plumbing size, and the height from the pond surface up to your filter return. That is everything we need to size a system properly.

We have been building and maintaining koi ponds from San Jose since 1998, and we run this gear on our own systems. We would rather talk you into the right pump than sell you the biggest one.

Have us size your systemFull pond guide & calculator