Fi-Clor pH Reducer – Acid

HTH / Fi-Clor pH reducer is used for lowering the pH level in swimming pool water. pH is a measure of how acid or how alkaline the water is.

£24.99 inc VAT

In stock

Product reference: 1134 Category:


Fi-Clor pH Reducer (Minus) – AcidNow HTH Brand
Fi-Clor pH reducer is used for lowering the pH level in swimming pool water.
pH is a measure of how acid or how alkaline the water is. High pH can result in cloudy water and contribute to scale formation.
More importantly, it will reduce the effectiveness of chlorine based sanitisers as they produce less free active chlorine.
High alkalinity will make it difficult to adjust the pH as any correcting chemicals will be taken up by the alkalinity and are unable to alter the pH.
Instructions to correct high pH:Calculate the volume of water in your pool if in doubt refer to the Fi-Clor Swimming Pool Handbook in our downloads section.
Take a pH reading using your test kit or test strips. You will need to lower the pH if the reading is above 7.6.
Pre-dissolve the Fi-Clor pH & Alkalinity Reducer in pool water using a suitable container. In order to avoid concentrated solutions, only dissolve a maximum of 500g of the product in 10 litres of water at a time, adding product to water, never water to product.
If you need to use more than 500g Fi-Clor pH & Alkalinity Reducer, repeat the treatment. Dose no more than a total of 1kg at a time.
With the circulation system running, distribute evenly around the pool, avoiding the skimmers.
Continue filtration and re-test after 24 hours. If the pH is still high, repeat the dose.
To correct total alkalinity
Determine the total alkalinity level using a test kit or test strips. If the reading is above 200mg/l (ppm), pre-dissolve 1kg of the product as described, and pour the solution in a small area at the deep end of the pool. Each application will reduce the alkalinity by approx 10 – 20mg/l.
Re-test after 24 hours. If the total alkalinity is still high, repeat the dose until total alkalinity falls below 200mg/l (ppm), varying the location slightly but avoiding the skimmers.

Warranty & Returns

This product is fully CE approved, but as a chemical based product returns are restricted, and the means of return have to be approved by us, prior to the item being returned due to the nature of these goods.

Should you require any further information, please email where we will respond to your request quickly.

Stock & Delivery

This product is in stock at our warehouse and is ready for Express or Economy Delivery Service.

Delivery – Mainland UK
Orders placed before 2pm Monday to Friday we aim to dispatch on the same day, after 2pm will be the following working day. This does not include Bank Holidays, which are classed as non-working days. Should you require a Saturday delivery or have any other delivery enquiries, please email who will respond to your request quickly.

Try to include your mobile phone number in the checkout area so that our delivery drivers can contact you should they need any further assistance or clarification in delivering your order.

Please ensure you leave detailed information if your delivery address is hard to find or a new housing development. If you know there is a possibility of missing the delivery, you can at the checkout stage leave instructions for the delivery driver to leave without signature and place your goods with a neighbour or in a discreet place out of sight for your later retrieval.

Please note some areas including Scotland(post codes AB, FK, IV, KW, PA, PH, HS, KA, ZE, TR, DD,PH, PA, KY, AB, DD, KW, IV, HS), Isle of Wight, Isle of Man, will need extra carriage. We no longer ship to Jersey, Guernsey or Northern Ireland.


If you are unable to thoroughly check your delivery upon receipt, sign for it as UNCHECKED. If the package is damaged in any way, no matter how small, please sign for it as DAMAGED. We CANNOT CLAIM from our carriers for any damaged items that have not been signed for as UNCHECKED or DAMAGED.

If you sign for a delivery as OK, which you later find to be damaged, our carriers WILL NOT accept liability and you may be charged for the damaged items, in this case a delivery charge for replacement items WILL be made.