Pentair EC-145333 – Sand Dollar® SD80 26″ Top-Mount Sand Filter

Product Overview

The Pentair EC-145333 Sand Dollar® SD80 is a top-mount sand filter designed for inground pools. Featuring a 26″ diameter tank, this filter delivers efficient, low-maintenance operation with a one-piece thermoplastic body, six-position multiport valve, and combination water/sand drain for fast servicing.

Key Features

• 26″ diameter thermoplastic tank built for strength and corrosion resistance.
• Six-position multiport valve mounted on top for filter, backwash, rinse, waste, recirculate and closed modes.
• Combination sand and water drain simplifies winterizing and servicing.
• Special internal lateral design maintains an even sand bed for consistent water flow and extended filter cycles.
• High-performance model capable of handling significant flow volumes with reliable filtration.

Technical Specifications

• Part Number: EC-145333
• Tank Diameter: 26″
• Filter Area: ~3.5 sq ft
• Flow Rate: Approximately 75 gpm (varies by system)
• Sand Required: ~350 lbs of #20 silica sand (not included)
• Plumbing: 1½″ multiport valve with standard ports
• Material: One-piece thermoplastic tank and fittings

Applications & Fitment

This filter is intended for residential inground pools where higher flow filtration is needed. It’s especially suited for systems that demand reliability, minimal service time, and durable construction. Confirm your pump’s flow rate, plumbing configuration, and available space before installing.

Installation Instructions

• Ensure the filter is placed on a stable, level surface capable of supporting its full sand weight (~350 lbs plus water).
• Install the multiport valve on top of the tank and connect the inlet and outlet plumbing per markings “PUMP” and “RETURN”.
• Fill the tank partially with water to protect the laterals, add the specified sand amount, then reassemble the valve and lid.
• Prime and start the pump in BACKWASH mode first, then rinse, and finally set the valve to FILTER mode. Monitor pressure and check for leaks.

Troubleshooting & Maintenance

• High pressure rise or frequent backwashing: Check for clogged sand, compacted sand bed or inadequate sand depth. Replace sand every 5–7 years if needed.
• Low flow or water clarity issues: Verify valve is set to FILTER mode, inspect for damaged laterals or blockages, and ensure sand bed is level.
• Leaks or valve malfunction: Inspect valve O-rings, clamp ring (if applicable) and multiport valve for wear. Replace as needed.

Maintenance Tip

Backwash the filter when pressure rises 8-10 psi above clean starting pressure or when flow visibly reduces. Flush fine debris during the rinse cycle. Clean the tank internals annually and replace sand every 5–7 years to maintain optimum performance. Regular service ensures clearer water and longer equipment life.