1. See Detail

High Performance Filtration | Whole House Calcite Water Filter | Adjust pH from Acidic to Neutral | 52" X 12" (GT1-18C)

In stock
4 Interest Free Payments of $296.25

Whole House Calcite Water Filter | Adjust pH from Acidic to Neutral | 52" x 12" (GT1-18C)

Suitable for tank water with a pH below 7 to help protect your plumbing fixtures/copper pipework from corrosion and degradation. Please contact us prior to ordering to ensure that you are getting the correct system for your requirements. 

Diagram example of how the GT1-18C Calcite Vessel should be installed alongside a Twin Whole House UV Rain Water Treatment System.
(Note: Tank, Pump, Twin Big Blue Filter Housings, UV System, Weatherproof UV Enclosure, Single Socket Surge Protector & Bypass Valves not included).

Kit Includes:

  • 1x Media Vessel
  • 1x Runxin 1" Multiport Backwash Valve & Lateral Drop Tube
  • 1x 20kg Bag Filter Sand/Gravel
  • 4x 20kg Bags Calcite Filter Media
  • Instruction/Warranty Sheet

Specifications & Technical Data:

  • Vessel Size: 52" x 12"
  • Polyethylene Inner Shell
  • Max Pressure: 150 PSI (10.5 Bar)
  • Max Temperature: 50 C (122 F)
  • Min Temperature: 1 C (34 F)
  • Max Vacuum: 140mmHg (5.5" Hg) Negative Pressure (Do NOT exceed Specifications)
  • Vessel approved for water filtration use only. All other applications must be approved by the manufacturer.
  • Do not use for pneumatic or Hydro-pneumatic application.
  • Vessel must NOT be exposed to temperatures lower than -30 Degrees Celcius.
  • This Vessel complies with all requirements of P.E.D 97/23/EC Directive.
  • This water pressure vessel is tested & compliant to NSF/ANSI Standard 44 for Material and Structual Requirements Only.

Required for Installation - Add to Cart or Supply Your Own:

GT15-1 1" Spring Loaded Check Valve (Prevents Backflow)

This media vessel will require a 1-way valve (check valve) installed behind it to avoid negative pressure in the system caused by a sudden backflow of water. It is also recommended that you include an isolation valve for easy maintenance when re-filling the vessel.

GT36-83N - Neoprene UV-Resistant FRP Tank Cover (Recommended)

Constructed with UV-resistant neoprene, this tank cover ensures optimal performance even in the most demanding environments. Whether you need protection against sunlight, extreme temperatures, or other exposure, this cover has got you covered. It effectively shields your tanks from harmful UV rays, preventing degradation and extending their lifespan.

Optional Add On - Media Funnel:

The specially-designed Media Funnel helps you fill the vessel without spilling expensive media, or getting the media stuck inside the drop tube! Use this funnel to save yourself from the hassle of having to try and push the drop tube back down into the dense media (because you've accidentally dropped media inside the tube, and had to pull the tube out to empty it)!

Why do you need a calcite filter for rainwater?

The issue of tank water acidity is of particular concern for customers with the poly/steel tank + copper pipes combo - this must be addressed in order to prevent copper pipe corrosion and pinhole leaks in your pipework later down the track (which is very costly to fix)! 

Rain water is commonly known to be in a very acidic state (around a pH of 5) naturally, and it is only when it comes into contact with earth or other organic material that the pH rises to neutral and even alkaline levels. However when you have clean gutters and a new clean poly tank (or a poly-lined steel tank), there is no organic or inorganic matter to dissolve into the water to raise the pH, thus you are left with highly acidic water sitting in your tank. This can cause extensive health issues in the long term, but it may also affect your plumbing work throughout your house. Copper is easily corroded by acidic water - if this is happening in your home, you will notice a blue/green tinge which is a signal that copper is dissolving into your water. Acidic water works its way from the inside out and if left long enough untreated, may cause your entire copper pipework to fail and need replacing.

Have you checked for signs of copper pipe corrosion in your home? Above are some examples of copper pipe corrosion, which is easily detected by the presence of blue-green staining around drains, fixtures and faucets. In the worst-case scenario, copper pipe corrosion will start with pinhole leaks, progress to multiple holes, and will eventually require you to replace the entirety of the copper pipework of your home!

This brings us to the solution to acidic water - the Calcite Filter. The GT1-18 Calcite Vessel filter features two stages of filtration:

  1. Stage 1: Filter Gravel - Gravel acts as a sand filter, filtering out dirt, sediment, and other particulates in the water.
  2. Stage 2: Calcite Marble - The way Calcite Marble filtration works, is by dissolving traces of calcium into the water to help buffer the pH back to neutral. The Calcite Marble supplied with this system is of the highest quality available in Australia, providing a consistent pH buffer and a long filtering life. On average you will need to refill about 1/2 to 1 bag full of Calcite Marble per year (which depends on water usage + pH of incoming water). We recommend that you buy a few spare bags of Calcite Marble with your order so you have it on hand for when you need to top up the calcite filter.

The drop tube is pre-cut to length and fits snugly in the centre hole of the vessel (there is a port at the bottom of the vessel that the drop tube will sit in snugly). There will be no need to cut the drop tube. The system is also fitted with a Manual Multi-Port Valve for easy and efficient backwashing of the system, again, saving you time and effort in maintaining the system.

Do I need Magnesium pH Booster Filter Media?

Please contact us prior to ordering pH Booster Filter Media. This will ensure that you are receiving the correct product for your intended purpose.

If you are considering a Calcite Vessel as part of your tank filtration set up AND the pH of your tank water is below pH. 5, you may need to add pH Booster Filter Media (Magnesium) to get the correct final pH. Adding pH Booster Filter Media to water with a pH below 5 alters the water chemistry to enable the uptake of Calcite (Calcium). For this intended use you will see the pH range anywhere from ph. 7-8 or higher depending on the pH of the incoming water. Note: when using magnesium as a pH booster, the pH will likely be above 8 when the media is new and will gradually lower over time. We recommend that you buy a spare bag of Magnesium pH Booster with your order so you have it on hand for when you need to top up the filter.

Please note that magnesium can leave a slight residual metallic taste in the water. This taste is easily removed by carbon post-filtration (included in this kit) which will produce clean, sweet-tasting water.

Using Magnesium & Calcite Together + Maintenance/Refill Instructions

Calcite and Magnesium are two common types of filter media used for pH adjustments in Rain or Bore Water. These types of media will slowly dissolve into the water over time which will mean that they require replenishment to maintain high flow rate capacity.

  • When first using a pH filter media, follow the same backwash and rinse cycles as mentioned in the system instruction manual.
  • In cases where Magnesium and Calcite are used together, add the calcite to the vessel first, then add the Magnesium on top. Ensure that you do not overfill the vessel.
    • If the pH is around 5, fill the vessel with a ratio of 80kg (4x 20kg boxes) of Calcite to 7.5kg (approx. 1/3 bag) of Magnesium.
    • If the pH is around 4.5, fill the vessel with a ratio of 71.25kg Calcite to 10-12kg (approx. 1/2 bag) of Magnesium.
  • Test your pH ongoing and add more filter media when the pH drops below the minimum desired level (ie. 6.8 pH).


More Information
Type Water Filter

Return Policy

Due to the nature of the products we sell, a strict return policy is in place. We work with food-grade certified materials that must be un-opened and un-used, so as to be able to be re-sold. This policy falls in line with the Australian Consumer Law, which is designed to protect BOTH BUYERS AND SELLERS. 

You may receive a refund or credit of equal amount, less the Restocking/Out-of-Pocket Shipping Expense Fee, if applicable, and any other deductions that are relevant. 

  • 30-Day Returns Policy: Returns will not be accepted without prior approval or after 30 days of the invoice date.

  • Wrongly Purchased Items/Changes of Mind Policy: Wrongly Purchased Items, or Change of Mind Purchases may be returned for a merchandise credit. This applies to, but is not limited to purchases of products that are:
    • The Wrong Size;
    • The Wrong System;
    • The Wrong Replacement Pack;
    • Due to a Change of Mind;
    • Due to Buyer Error, whereby the buyer has failed to conduct proper due diligence (including contacting FSA prior to purchase in order to clarify the relevant technical specifications, compatibility, requirements etc.) to ensure the product purchased from us is the correct product for their requirements.
  • Restocking/Out-of-Pocket Shipping Expense Fees Policy: All returns will incur a 17.5% restocking fee OR an out-of-pocket shipping expense fee, whichever is greater. 
    • This fee is in place to cover the administrative expense incurred in processing the return and/or the out-of-pocket expenses incurred by us in shipping the item to you. FSA may use its discretion to determine the restocking fee. Please note this policy falls in line with the ACL, and is designed to protect us as the seller from losses incurred due to buyer error. This means that you will NOT receive a full refund of the original purchase price - you will bear the cost of shipping the product back to us, and then you will receive a credit equal to the purchase price of the product LESS the Restocking/Out-of-Pocket Shipping Expense Fee. Please refer to our Shipping Policies (below) for further clarification.
    • Low-Value Returns: Please note that with low-value items, sometimes the cost of sending the item back to us may be more expensive to you, than simply keeping the item. For example, let's say you have ordered 3x meters of the wrong-sized tubing for your needs and paid $12.00. If, for example, it cost us $7.69 to send the item to you, and it would cost you $7.69 to send the item back to us, overall you would be $3.38 worse off (due to incurring $7.69 to send the item back to us, and having $7.69 taken out of the credit) than if you had kept the item and re-ordered the correct product for your needs. 

  • Shipping Policies: 
    • Free Shipping Offer: As part of our offer of Free shipping Australia-Wide, FSA reserves the right to select the most cost-effective courier to effect delivery of the product to you. We make no guarantee as to how long an item will take to arrive due to unforeseen circumstances outside of ours/the couriers' control, including but not limited to: Staff Shortages, Supply Chain Demand, Extreme Weather Events etc.
    • Express Shipping Policy: If you require an item on an urgent or Express basis, it is your (the buyer's) responsibility to contact us directly by telephone on [phone removed by eBay] prior to purchase, in order that we may quote you the options available for Express Delivery to your nominated address, and to organise additional payment for this Express Service. Express Shipping is not included in our offer of free shipping - this service will come at an additional cost payable by the buyer. 
    • Late Shipping Policy: Given that we offer the option for customers to organise Express Shipping with us prior to purchase, cancellations or refunds will NOT be issued on the basis of late or delayed shipping where the customer has opted for our Free Shipping offer. If the item (sent via Free Shipping), arrives late and the buyer wishes to return the item on this basis, the buyer will be liable for the cost of returning the product to us and a Restocking/Out-of-Pocket Shipping Expense Fee will be applicable to the return, as per the listed returns policy line items above. The customer will be issued a merchandise credit.
    • Our offer of Free Shipping does not apply to Returns: Whilst we offer Free Shipping, this does not mean that there is no cost to ship the product - obviously, a shipping expense is incurred, and as with all e-commerce operators that offer Free Shipping, the cost of shipping the product from our warehouse to your nominated shipping address is built into the price of the product. The offer of Free Shipping therefore only applies to the act of FSA supplying the product to you, and does not cover the cost of returning the product from the customer to FSA.
    • Returned to Sender Items: In the case of the buyer being unavailable to sign, refusing delivery, or the item being sent back to us for whatever reason, FSA may, at its discretion, pass the cost of the product being Returned to Sender (i.e. being returned back to us), back onto the buyer. Refer to Restocking/Out-of-Pocket Shipping Expense Fees (above).
    • Lost Parcels: If an item is deemed to be LOST IN TRANSIT by the courier, the customer is entitled to a replacement product or refund in line with the ACL. In the case of a replacement product, FSA reserves the right to send the replacement product in line with its Free Shipping offer. If you do require the replacement item urgently, please get in touch with our customer service team directly to organise Express Shipping. 

  • Product Damage & Product Faults: Any damage to products that are not reported to FSA within 48 business hours of receipted delivery is not covered under our transit warranty. Return shipping is to be paid by the buyer to the address provided by FSA. It is recommended that the customer applies a transit warranty to the return freight item/s, in case of damage.
    • Faults: Should the item appear faulty or doesn’t work as described, you must supply written/photographic/video evidence of the fault to us, so that we may assess whether the unit/item must be returned for testing (if requested). If testing is requested, return postage is to be paid by the buyer. 
      • If the unit/item is deemed to be faulty, compensation will be provided for the postage cost (proof of cost required). 
      • If the unit/item is deemed to be in working order and as described, the buyer will be responsible for the cost of return postage of the product from FSA's premises, back to the buyer. 
    • Minor Damage: Any damages (minor, that can be repaired) will incur a fee, that will be deducted from the total refund which will be equal to the cost of the replacement parts (List Price) and labour charges (if applicable) to repair the system(s). This will be separate from the Restocking/Out-of-Pocket Shipping Expense Fees.
    • Major Damage: Any damage considered to be major and not feasible for repair may be refused and the return request will be void. The customer will be responsible for the return freight or disposal of the damaged unit.

Returns are not accepted on special order items unless the manufacturer allows it. Applicable fees will apply.

If you have any questions about our return policy, please contact us before purchasing. This will also help to ensure you purchase the correct product that suits your requirements.