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Magnesium is present in natural sea water in a fairly high concentration (1350 - 1500 mg/L) and is an essential element of chlorophyll which is necessary for photosynthesis. Without photosynthesis plants, algae and coral would not be able to survive.

Magnesium also helps to maintain the correct combination of calcium concentration and alkalinity as it slows down the formation of calcium carbonate which can absorb many important trace elements within the aquarium.

Maintaining a correct magnesium concentration is therefore very important and is indirectly responsible for fast coral and calcareous algae growth by making it possible to maintain correct calcium and alkalinity figures.

Magnesium is depleted by algae growth and also by the use of excessive kalkwasser or by going far beyond natural calcium, alkalinity and pH values.

The Salifert Magnesium Profi-Test is easy to use and accurate with measurements in steps of 30 mg/L.

Results are not affected by strontium and calcium interference.

Can be used for marine water only.

Calcium and strontium will not interfere when their total concentration is between 200 and 650 ppm. This is mostly the case.

Up to 50 tests.

FREE SHIPPING OVER $119!*

- does not apply to livestock -

$11.99 FLAT RATE FOR LESS THAN $119.00 - CANADA WIDE!

*EXCEPTIONS:

• Any heavy or bulky items will incur a 100% charge of the actual shipping cost (valid for both Canada and the US). Heavy bulky items include (but are not limited to): salt, dry rock, sand, chillers, sumps, aquariums, stands, and some filter media.
• Frozen or perishable food can only be shipped via UPS Express. We have discounted the express shipping of these items to help the hobbyist out.
• Livestock is covered by a different shipping policy. To view the policy and further information regarding shipping livestock, click here.

GENERAL NOTES:

• We always make our best effort to ship your order via the carrier chosen during the check-out process; however, for some multi-piece shipments and/or remote destinations, we must reserve the right to use another carrier at our discretion (and without prior notice). If you require notice of any changes made to the carrier, please mention it in the special instructions during check-out.
• Upon request, we will ship your dry goods as per your specifications (courier, airlines, on your account, etc.).
• Quoted rates are the carriers live discounted shipping rates after adjusting for any/all shipping promotions.

Return Policy — Aquarium Equipment & Supplies

• All returns and/or exchanges must be made within 30 days of receipt of product.
• Before returning or exchanging any goods, you must contact J&L Aquatics to obtain a Return Merchandise Authorization (RMA). Items returned without prior authorization will be declined.
• Returned items must be unused, in original packaging, in as-new condition, and in perfect sellable condition. All returns are subject to inspection upon receipt.
• A 15% restocking fee applies to all online returns. This fee includes the cost of outbound shipping.
• Customer is responsible for return shipping costs on standard returns.
• Order cancellations made before shipping are not subject to a restocking fee.

Non-Returnable Items

• Special order items
• Clearance / final sale items
• Open box items

Regular sale items (non-clearance) are returnable within the 30-day return window, subject to our standard return conditions.

Defective, Warranty & DOA Items

• If you receive an item that is defective, not working, or dead on arrival (DOA), please contact us as soon as possible.
• Confirmed defective and warranty returns have no restocking fee and no Affirm fee. Customer does not pay return shipping — J&L Aquatics will provide a prepaid return label.
• All defective claims are subject to inspection. Items showing signs of customer damage, improper installation, or misuse are not covered under warranty.

Carrier Damage & Lost in Transit

• If your order arrives damaged by the carrier or is lost in transit, please contact us right away with:Photos of the damaged product (if applicable)Photos of the damaged box/packaging (if applicable)A description of the issue
• Important — Do not throw out any packaging! Please keep all original packaging, boxes, and packing materials. These are required to process your claim. Discarding packaging may affect our ability to resolve your claim.

High-Value Items ($100+)

• For items valued at $100 or more, customers must provide a return tracking number before a replacement will be shipped.

Affirm & Financing Orders

• Affirm or similar financing orders that are cancelled or returned in-store are subject to a 5% service charge. This covers the processing fee charged to us by the financing provider.
• The Affirm service charge does not apply to confirmed defective or warranty returns.