Great Aquariums Start Here
Live Chat Support
    Free Shipping On $75+
  • FREE Shipping On $75+
  • 14-Day Low Price Guarantee
  • Low Price Guarantee
  • Same Day Shipping
  • Same Day Shipping
FREE Shipping on
Orders Over $75
Standard ground shipping (1-7 business days) starts at a low $4.99 and most orders over $75 ship FREE. Learn More
If you find a product we sell for a lower price at another online store, we will match their price—today and up to 14 days after you've purchased the item! Learn More
Same Day Shipping
We promise to ship your order as fast as humanly possible. In fact, 99% of orders placed before 6 pm EST ship the same day! Learn More
Home » Saltwater Aquarium Supplies  » Reverse Osmosis  » Replacement Filters  » Kits  »  SpectraPure® MaxCap RO/DI Replacement Filter Kit
SpectraPure® MaxCap RO/DI Replacement Filter Kit

SpectraPure® MaxCap RO/DI Replacement Filter Kit

Average Rating 4.5 7
Write A Review
Product Review
We value your opinion & experience
Thank you for taking the time to review our products!

This is a Product Review for: SpectraPure® MaxCap RO/DI Replacement Filter Kit
Name to display on the review:
Location (ex: Anaheim, CA):
Your experience level:
How would you rate this product?
Review Title:
Write your review:
(Please focus on product quality and performance)
In Stock: Buy now and your order will ship the next business day
Item #:
Notify Me
Just enter your email address below and we'll let you know when the product you are looking for becomes available!

Item Code:
Your Email:
Add to Cart or Notify Me
This item is temporarily unavailable but will be back in stock soon.

Item #
Click the Add To Cart button below if you'd like to reserve this item today. Any other items included in your order will be immediately processed and shipped. We will ship this item separately as soon as it arrives. We will not charge you for this item until it ships and you will incur no additional shipping charges.
Enter your email address in the field below and click the Notify Me button if you'd like us to send you an email when this item becomes available. Although you will be immediately notified when we have stock on hand, we will not reserve any units for you; you must return to our website and place an order.

+ Add to Wishlist
Add to Wishlist
Select Wish List:
Comments (up to 200 characters):
Quantity Desired:
Quantity Received:
Qualifies for Free Shipping!
FREE Shipping Promo offers FREE standard ground shipping via UPS on orders of $75 or more for orders containing non-overweight or oversize items (orders which do not qualify for our FREE shipping promotion will still be shipped at a discounted rate).

Terms and Exclusions:
  • Offer valid only on orders shipping within the contiguous United States. Orders shipping to Alaska, Hawaii, Puerto Rico, Guam or other US Territories do not qualify for this promotion.

  • This promotion does not apply to items requiring expedited shipping, such as refrigerated products, frozen products or live rock.

  •'s FREE shipping promotion does not include products sent in oversized or particularly heavy boxes. This may include but is not limited to aquariums, canopies, chillers, external water pumps, metal halide magnetic ballasts, stands and substrate/sand. These items may be subject to additional shipping handling charges. Should shipping surcharges apply, they will be noted on individual product pages and / or displayed during check-out. We will, however, pay a portion of the shipping charges for these orders.

  • Shipping surcharges, such as special handling are NOT covered under the FREE shipping promotion.

  • Shipping charges for returned merchandise is non-refundable. Please read's Return PolicyPolicy for more information.

  • Price matched (Low Price Guarantee) or discounted orders do NOT qualify for our free shipping promotion.
If you find a product we sell for a lower price at another online store, we will match their price to ensure you always pay the lowest amount when you shop with us.

Enter the price, shipping cost and website address where you found the lower price. Then click the "Add to Cart" button. We will review the lower price while processing your order and make any necessary reductions before your order ships. Some restrictions apply. See Terms & Conditions.
Shipping Cost*
Competitor's Website*
*Required information
Marine Depot 60-day Returns
At Marine Depot, we stand behind our products. That is why we offer a 60-day return period: one of the best in the industry! Learn More

SpectraPure® MaxCap RO/DI Replacement Filter Kit Information

SpectraPure® MaxCap RO/DI Replacement Filter Kit

Kit Includes:
1 x 1/2 micron dual density gradient sediment filter
1 x 1/2 micron carbon block prefilter
1 x SpectraPure® MaxCap DI™ cartridge
1 x SpectraPure® SilicaBuster™ Mixed-Bed Multi-Layer DI Cartridge

1/2 micron dual density gradient sediment filter
manufactured from 100% pure polypropylene fibers. The fibers have been carefully spun together to form a true gradient density from outer to inner surfaces.
polypropylene construction provides superior chemical resistance and is not prone to bacterial attack.
they will not impart taste, odor or color to the liquid being filtered when used within the recommended temperature limit.
designed for purity

1/2 micron carbon block prefilter
highly effective at reducing unwanted taste, odor, chlorine, fine sediments and pesticides.
nominal 0.5-micron rating
effective at reducing Cryptosporidium and Giardia cysts
made entirely from FDA-compliant materials

SpectraPure® MaxCap DI™ cartridge
The revolutionary MaxCap DI ™ cartridge has over 3 times more capacity than any other Mixed-Bed or Hi-Silica removal deionizing cartridge. When placed upstream of your existing DI cartridge, the life of your downstream DI will increase by nine times or more! This incredible break-through in DI cartridge technology will reduce your costs to produce DI water by over 50%.

In many applications, the MaxCap DI™ can be used as a “roughing” cartridge when installed up-stream of a Mixed-Bed or Hi-Silica removal cartridge. For example, if the RO water entering the Max Cap DI™ has 25 ppm TDS (Total Dissolved Solids), the original DI cartridge may process about 200 gallons of pure DI water. By placing a MaxCap DI™ cartridge in front of the original cartridge 600 gallons of water will pass through both cartridges before the Max Cap DI™ is exhausted. The original DI cartridge will be only one-third exhausted. A second Max Cap DI™ will process another 600 gallons and the original cartridge will now be two-thirds exhausted. Only after a third Max Cap DI™ cartridge processes another 600 gallons will the original cartridge finally become fully exhausted. This example illustrates that three Max Cap DI™ cartridges plus the original mixed-bed cartridge will process 1800 gallons of pure DI water. It would have taken nine original mixed-bed cartridges to produce the same amount of pure DI water.

*Note: Cartridge maybe either white or clear in color.

SpectraPure® SilicaBuster™ Mixed-Bed Multi-Layer DI Cartridge
SpectraPure® SilicaBuster™ Mixed-Bed Multi-Layer Deionization Cartridges are fabricated with semiconductor grade resins for highest possible purity water. They are capable of producing 18 meg ohm-cm resistivity water. They are the first deionization cartridges designed to reduce silica, nitrates and phosphate levels in the low ppb range. These newly formulated cartridges far exceed the performance of previous cartridges, offering enhanced contaminant removal, longer life and higher purity.

Caution: The deionization cartridge life is greatly reduced when operated on low pH waters, or water with high CO2 (carbon dioxide) levels. The exact cartridge life will vary greatly with pH, carbon dioxide levels, and TDS etc. in your RO water or the feed water supplying the RO system. Aeration or de-gasification of RO product water is recommended for such waters for removal of carbon dioxide.
  • For ultra high purity water (18 meg ohm-cm resistivity)
  • Enhanced silica removal
  • Highest silica, nitrate, phosphate, and heavy metal removal of any 10" DI cartridge available
  • Aluminized mylar packaging eliminates DI cartridge degradation
  • Non color-indicating resins for lowest TOC levels
  • Non color-indicating semiconductor grade resins used for highest purity
  • Optimized for post RO or post distillation filtration
  • Higher capacity than other similar size cartridges

Manufacturer Info

SpectraPure Aquarium Supplies
SpectraPure was established in 1985 and is located in Tempe, Arizona, home of Arizona State University. SpectraPure is dedicated to excellence in the design and manufacture of water filtration and purification systems for household, commercial, laboratory and light industrial applications. Their product lines includes a full range of systems and equipment, including drinking water systems, water softeners, filtration systems, reverse osmosis units, RO/DI and deionization systems and many other technological innovations and water purification accessories. SpectraPure provides innovative, state-of-the-art solutions to water purity problems and applications.

SpectraPure® MaxCap RO/DI Replacement Filter Kit Reviews

Average Rating
(7 reviews)
Sort Reviews By:

spectra pure maxcap rodi kit

Reviewers Rating Excellent!

Posted: 10/4/2015 from NAVARRE, FL UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: as always, prompt shipping and order was perfect thanks

Did you find this review helpful? Yes No

Awesome service

Reviewers Rating Excellent!

Posted: 7/4/2015 from Selden, NY UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: I ordered these filters and upon installation, found one of them to be defective. I called Marine Depot and discussed it with them and they walked me through and checked everything and confirmed it was a defective cartridge. They immediately shipped out another replacement overnight, no problems. Because of their concern and superior level of service, I am re-ordering with them again. Knowing they have my back in situations like this is very comforting!

Did you find this review helpful? Yes No

OKay I guess?

Reviewers Rating Average

Posted: 2/5/2015 from BOWIE, MD UNITED STATES
3.0 5
Experience Level: Intermediate

Comments: ....But the advertizement photo shows see through; what you actually get is the last two canister sealed in a non see through container, and it is not self indicating when to change, which I thought I was buying. Having said that, i just brought them one week, and Zero DTS Readings :) ....we'll have to wait and see.

Did you find this review helpful? Yes No

watch what you order

Reviewers Rating Great

Posted: 1/14/2015 from ROSEVILLE, CA UNITED STATES
4.0 5
Experience Level: Expert

Comments: I have always used SpectaPure products and can tell you that they are great products, I usually order straight from SpectrPure but decided to order thru Marine Depot, I noticed the price was better so I thought what the heck, when the cartridge's arrived I noticed one big difference, you cannot see the media , I ORDERED THE NON INDICATING !!!!!!! that's why the price was better... watch what you are ordering but great product.

Did you find this review helpful? Yes No


Reviewers Rating Excellent!

Posted: 8/25/2014 from HOUSTON, TX UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: 100% I recommend , even better from the originals that come with the ro

0 of 2 People found this review helpful, did you? Yes No

To easy

Reviewers Rating Excellent!

Posted: 5/1/2014 from NEW ROCHELLE, NY UNITED STATES
5.0 5
Experience Level: Expert

Comments: - After 3 years using my RO/DI unit, it was about time to change my filters. Spectra Pure's replacement filter kit was direct replacement for my 5 stage 90gpd unit.

Did you find this review helpful? Yes No

Works as advertised

Reviewers Rating Excellent!

Posted: 10/29/2013 from SAN RAMON, CA UNITED STATES
5.0 5
Experience Level: Beginner

Comments: These replacement units fit precisely and worked immediately bringing the dissolved solids from 380ppm to 0 on my RO/DI unit.

1 of 1 People found this review helpful, did you? Yes No

Try these related products

WIN A $499 ANGEL LED! Sign up for our best deals, how-to videos and a chance to win a Euroquatics A1P Angel LED!