The Colombo KH Test Kit contains all you need for accurate measurement of the KH level in ponds and both freshwater and saltwater aquariums. The Colombo KH Test Kit comes complete with test tube and liquid reagents to provide accurate results for 25 tests.

The KH is the so-called carbonate hardness or temporary hardness; in German Karbonathärte, abbreviated to KH. The KH is made up by forms of carbonic acid like bicarbonate and carbonate. The chemical balance between these substances leads to a stable pH and thus the adequate presence of these substances is essential for a stable pH; a stable pH in its turn is essential for the well-being of the fish. The KH is therefore often called the buffering capacity of the water. Especially in older aquaria and ponds, the pH and KH have a tendency to decrease, especially when there are no or little water changes. Hence, test the KH regularly and refresh 10% of the water weekly. An optimal pH-buffer in freshwater is obtained with a KH between 6 and 8°DH, in seawater with a KH between 8 and 12°DH. When the KH is above 12°DH, also the pH will be relatively high, and so you can lower both values in freshwater with Colombo pH-min. If the KH is lower than 6 or 8°DH, you can increase it with Colombo KH+.

Instructions For Use:
1. Take a water sample of 5ml.
2. Add 1 drop of KH-test fluid and mix. The sample should turn light-blue; when it turns yellow, the KH of the water is lower than 1°DH.
3. Add KH-test fluid drop by drop and mix each time, until the sample turns yellow.
4. The number of drops added to induce the colour change from blue to yellow, is equal to KH-value in °DH, so 2 drops = 2°DH, 3 drops = 3°DH and so on.

Cut Off Time

Order by 2pm for same day dispatch - Monday to Friday (Excluding Bank Holidays)

Please Note: Direct/Palletised Delivery items may take longer.

Orders Under £49

Standard Delivery (2-3 working days) - £3.99
Express Delivery (1-2 working days) - £5.99.

Orders Over £49

Standard Delivery (2-3 working days) - FREE!
Express Delivery (1-2 working days) - £2.99.

Timeframes are for standard mainland UK addresses only excluding NI, Scottish Highlands & Islands.

Palletised Deliveries

Some large oversize products, typically items weighing more than 30kg, may require delivery via pallet and as such will arrive as a kerbside delivery only. The drivers in these instances are unfortunately not permitted to assist with the pallet beyond the drop off, and cannot aid in bringing packages into the property.

Pond Planet will contact you to book in delivery on a suitable working day. Delivery will generally take place between 9am and 5pm. To ensure there are no delays with delivery, please include a contact number when placing the order.

Pond Plant Deliveries & Surcharge

Pond plants are subject to a £5.00 delivery surcharge. Pond plants are sent directly from our supplier to make sure the plants you receive are fresh and in great condition. There is no limit on how many you can order for a single delivery charge. This charge is in addition to any other carriage costs for items sent directly from Pond Planet. Please allow 5 -10 working days for delivery.

Returns

If for any reason you are not satisfied with your purchase from Pond Planet, you may return the product(s) to us within 14 days of the purchase date for a refund or exchange.

Goods must be returned in perfect and unused condition, in their original packaging. The buyer must ensures that the goods are securely and adequately packed to avoid damage and the purchaser pays all postage costs. We recommend that products are returned by recorded delivery or by a carrier that requires a signature. Pond Planet accepts no responsibility for goods returned to us unless signed proof can be provided.