Unicel Replacement Filter Cartridge for 50 sf Caldera Spa | C-7350
Unicel
SKU: C-7350
Unicel C-7350 Replacement Filter Cartridge – 50 sq ft
Part # C-7350 — a high-quality replacement filter cartridge designed for spa and small pool filtration systems requiring a 50 sq ft element. This cartridge restores filtration performance, improves water clarity, and helps maintain efficient system operation.
Key Features
- 50 sq ft of premium polyester filter media for strong dirt-holding capacity.
- Reinforced end caps and a durable center core for long service life.
- Open top and bottom design for easy installation in compatible housings.
- Standard dimensions: approximately 7″ diameter × 14¾″ length.
- High pleat count for extended run time between cleanings.
Typical Applications
This cartridge is ideal for spas, hot tubs, and small residential pool systems that use a 50 sq ft filtration element. It is commonly replaced when water flow decreases, pressure rises, or the original element becomes worn, torn, or permanently stained.
Installation & Compatibility Notes
Turn off the pump and relieve any system pressure before servicing. Remove the filter housing lid or cartridge cover and lift out the old element. Clean the filter tank and inspect sealing surfaces. Insert the new C-7350 cartridge, ensuring it seats correctly on the bottom support. Reassemble the housing, restore water flow and verify proper pressure and circulation.
Why Choose This Cartridge?
The C-7350 delivers reliable filtration performance with durable construction and high-quality media. Replacing worn cartridges helps maintain clean, clear water while reducing strain on your pump and prolonging equipment lifespan.
Maintenance Tips
- Clean the cartridge when system pressure rises 8–10 psi above the clean starting pressure.
- Rinse thoroughly with a hose; soak periodically in a cartridge-safe cleaning solution to remove oils and scale.
- Inspect pleats and end caps for tears, cracks or flattening — replace immediately if damaged.
- Rotate between two cartridges for improved longevity and reduced downtime.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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