Skip to main content
Shop by pool or need Shop by
Brands and series
Popular models and advice
Help me choose

Our tested shortlist for inground, above-ground, cordless and small pools, with what each robot does and does not include.

Find my robot

Free Shipping, 30-day trial and a low price guarantee on every robot. Talk to a Pool Pro

Pump types
Shop by horsepower
Shop by brand
Help choosing

Free Shipping and a low price guarantee on every pump. Need help sizing a pump?

Shop water monitors
Choose your ICO

Hourly water readings and personalized guidance in the ICO app, with no subscription required. Ask a Pool Pro

Ultraviolet systems
SpectraLight models
Parts and help

UV systems are sized to your pump's flow rate. Talk to a Pool Pro before you order.

Filters
Heaters
Lights
More departments

Can't find a part? We can usually source any pool or spa product.

Calculate
Compare equipment
Find products

Free tools for choosing and running pool equipment. See all tools or ask a Pool Pro.

Buying guides
ProLine and Max-Series reviews
From the review to the robot

Reviews are written by our in-house pool professionals from hands-on testing. How we test

Cartridge Filter S400 Assembly, Maytronics part 9991481-R1
Cartridge Filter S400 Assembly, photo 2Cartridge Filter S400 Assembly, photo 3Cartridge Filter S400 Assembly, photo 4

Genuine Maytronics part · Filters

Cartridge Filter S400 Assembly

Part number 9991481-R1 · 1-year parts warranty

$214 Maytronics list price

Out of stock

Some Maytronics parts are sold through dealers only. Send us your model number and we will quote it.

  • Replacement Ultra-Fine Filter Basket

Fits 26 Dolphin models: Quantum, Explorer E30, Explorer E50, Nautilus CC Pro and more. See the full list.

Fits these Dolphin robots

The models Maytronics lists for part 9991481-R1. Each one links to the robot and to its complete parts list.

Dolphin ProLine

Dolphin Explorer

Dolphin Nautilus

Dolphin Liberty

Dolphin Active

Dolphin Premium

Dolphin S-Line

Dolphin T-Line

Dolphin Advantage

Dolphin Proteus

Specifications

General Info

Warranty (years)
1

Size & Dimension

Package Dimensions
10.8x7.2x8.6 inch
Gross Weight
1.72 lb

Not sure this is the right part?

Send a Pool Pro your robot's model number (on the label under the handle) and a photo of the old part. We will confirm the Maytronics part number and where to get it.

or send a message