Natural Chemistry Calcium Increaser, 1.83 lb Bottle | 14205NCM

Natural Chemistry Calcium Increaser is designed to safely and effectively raise calcium hardness levels in spa and hot tub water. Proper calcium hardness, ideally between 150–250 ppm, is essential for protecting spa surfaces and equipment from corrosive water conditions. Low calcium levels can lead to pitting, etching, and equipment damage, making this product a key component in a balanced water maintenance routine.

In addition to preventing corrosion, maintaining proper calcium levels helps reduce cloudy water and supports overall water clarity and comfort. Easy to use and fast-acting, this formula ensures long-lasting spa health and performance.

Model: 14205NCM
Product Type: Spa Calcium Increaser
Container Size: 1.83 lb Bottle
Function: Raises calcium hardness in spa and hot tub water
Ideal Range: 150–250 ppm calcium hardness
Benefits: Prevents corrosion, protects spa surfaces and equipment, improves water clarity
Application: Simple to apply and fast-dissolving
Compatibility: Safe for use with all spa sanitizing systems

SKU: 14205NCM

Questions about returns? View our return policy.

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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.
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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.